Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] Range [Domain] Statistical Measurement [Domain] Federal Income Tax Jurisdiction, Domestic Federal [Member] Title of 12(b) Security Title of 12(b) Security Document Fiscal Year Focus Document Fiscal Year Focus Remaining performance obligation, expected timing of satisfaction, period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Adjustment to Compensation, Amount Adjustment to Compensation Amount Customer [Axis] Customer [Axis] Segment Reporting [Abstract] Common stock, $0.0001 par value per share, 100,000,000 shares authorized and 19,550,348 shares issued and outstanding at June 30, 2026 and 18,914,271 shares issued and outstanding at March 31, 2026 Common Stock, Value, Issued 2028 Lessee, Operating Lease, Liability, to be Paid, Year One Payments of withholding tax on net issuance of restricted stock Payment, Tax Withholding, Share-Based Payment Arrangement Initial payment received Collaborative Arrangement, Rights and Obligations, Initial Payment Received Collaborative Arrangement, Rights and Obligations, Initial Payment Received Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Wireless Licenses Wireless Licenses [Member] Wireless Licenses Restatement Determination Date Restatement Determination Date Broadband licenses granted, number of counties Broadband Licenses Granted, Number of Counties Broadband Licenses Granted, Number of Counties Restricted shares issued (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Cash paid during the period: Income Tax Paid, after Refund Received [Abstract] Amendment Flag Amendment Flag Current liabilities Liabilities, Current [Abstract] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding CPS Energy (“CPS”) CPS Energy [Member] CPS Energy Disposal Group Classification [Axis] Disposal Group Classification [Axis] Indefinite-lived Intangible Assets [Roll Forward] Intangible Asset, Indefinite-Lived [Roll Forward] Disposal Group, Held-for-Sale, Not Discontinued Operations Disposal Group, Held-for-Sale, Not Discontinued Operations [Member] Leases [Abstract] Leases [Abstract] Related Party Transactions Related Party Transactions Disclosure [Text Block] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Net additions Contract with Customer, Liability, Increase (Decrease) for Contract Acquired in Business Combination Entity Address, State or Province Entity Address, State or Province Licensing Agreements Licensing Agreements [Member] PEO Total Compensation Amount PEO Total Compensation Amount Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share CASH AND CASH EQUIVALENTS AND RESTRICTED CASH Cash and Cash Equivalents [Abstract] Weighted-average common shares used to compute basic net income per share (in shares) Basic weighted-average shares (in shares) Weighted Average Number of Shares Outstanding, Basic Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Right of use assets modifications and renewals Rights Of Use Asset For Modifications And Renewals Rights Of Use Asset For Modifications And Renewals Number of reportable segments Number of Reportable Segments Total current liabilities Liabilities, Current 2031 Lessee, Operating Lease, Liability, to be Paid, Year Four Non-cash investing activity: Non-cash investing activity: Noncash Investing Items [Abstract] Concentration Risk [Table] Concentration Risk [Table] Entity Address, City or Town Entity Address, City or Town Consideration transferred Asset Acquisition, Consideration Transferred Awards issued (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Acquisitions Intangible Asset, Indefinite-Lived, Acquired Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Collaborative Arrangement and Arrangement Other than Collaborative [Table] Collaborative Arrangement and Arrangement Other than Collaborative [Table] Revenue Benchmark Revenue Benchmark [Member] License License [Member] Accrued severance and other related charges Accrued Severance And Other Related Charges, Current Accrued Severance And Other Related Charges, Current Concentration Risk Type [Axis] Concentration Risk Type [Axis] Reduction in indefinite-lived intangible assets Intangible Asset, Indefinite-Lived, Period Increase (Decrease) Recently Issued Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Deferred revenue Increase (Decrease) in Contract with Customer, Liability Schedule of Operating Financial Results Segment Reporting [Table Text Block] Loss from disposal of long-lived assets, net Loss from disposal of long-lived assets, net Gain (Loss) on Disposition of Property Plant Equipment Employer contribution amount Defined Contribution Plan, Employer Discretionary Contribution Amount Broadband licenses transferred, total consideration Broadband Licenses Transferred, Total Consideration Broadband Licenses Transferred, Total Consideration Schedule of Accrued Liabilities Schedule of Accrued Liabilities [Table Text Block] Schedule of Lessor, Operating Lease Agreements Schedule Of Lessor, Operating Lease Agreements [Table Text Block] Schedule Of Lessor, Operating Lease Agreements Significant segment expenses and other segment items Segment Reporting, Reconciliation [Abstract] Gain on exchange of intangible assets, net Gain on exchange of intangible assets, net (Gain) Loss On Exchange Of Intangible Assets (Gain) Loss On Exchange Of Intangible Assets Broadband license(s) remaining Broadband Licenses Granted, Number Of License Remaining Broadband Licenses Granted, Number Of License Remaining Schedule of Future Minimum Payments Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Document Period End Date Document Period End Date Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding 2029 Lessee, Operating Lease, Liability, to be Paid, Year Two Security Exchange Name Security Exchange Name NorthWestern Energy (“NWE”) NorthWestern Energy [Member] NorthWestern Energy Entity Shell Company Entity Shell Company Operating lease liabilities Current liabilities - operating lease liabilities Operating Lease, Liability, Current Segments Segment Reporting, Policy [Policy Text Block] Net Income Per Share of Common Stock Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Earnings Per Share [Abstract] Earnings Per Share [Abstract] Derecognition of contingent liability related to sale of intangible assets Derecognition Of Contingent Liability Related To Sale Of Intangible Assets Derecognition Of Contingent Liability Related To Sale Of Intangible Assets Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Total liabilities Liabilities Trading Symbol Trading Symbol Balance at the beginning of period Intangible assets Intangible Asset, Excluding Goodwill, Indefinite-Lived Purchases of equipment Payments to Acquire Property, Plant, and Equipment Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Adjusted general and administrative General And Administrative Expense, Adjusted General And Administrative Expense, Adjusted Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Company Selected Measure Name Company Selected Measure Name 2023 Stock Plan 2023 Stock Plan [Member] 2023 Stock Plan Sale of intangible assets Intangible Asset, Indefinite-Lived, Divestiture Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Gain on sale of intangible assets, net Gain on sale of intangible assets Gain On Sale Of Intangible Assets Gain On Sale Of Intangible Assets Concentration Risk [Line Items] Concentration Risk [Line Items] Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Related Party Transactions [Abstract] Related Party Transactions [Abstract] Income Tax Disclosure [Line Items] Income Tax Disclosure [Line Items] Income Tax Disclosure [Line Items] Non-trade receivable Increase (Decrease) In Nontrade Receivables Increase (Decrease) In Nontrade Receivables Compensation Amount Outstanding Recovery Compensation Amount Amortization Capitalized Contract Cost, Amortization Individual: Individual [Axis] Weighted-average common shares used to compute diluted net income per share (in shares) Diluted weighted-average common shares (in shares) Weighted Average Number of Shares Outstanding, Diluted Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Amount representing interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Xcel Energy Services Inc. (“Xcel Energy”) Xcel Energy Xcel Energy Services Inc. [Member] Xcel Energy Services Inc. Schedule of Contract Assets Contract with Customer, Contract Asset [Table Text Block] Contract with Customer, Contract Asset [Table Text Block] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Operating leases paid Operating Lease, Payments Payments remaining Revenue, Remaining Performance Obligation, Payments Remaining Revenue, Remaining Performance Obligation, Payments Remaining Award Timing Predetermined Award Timing Predetermined [Flag] Intangible Asset, Goodwill and Other [Abstract] Intangible Asset, Goodwill and Other [Abstract] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Stock compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Lower Colorado River Authority (LCRA) LCRA Agreement Lower Colorado River Authority (LCRA) [Member] Lower Colorado River Authority (LCRA) Indefinite-lived Intangible Assets, Major Class Name [Domain] Intangible Asset, Indefinite-Lived, Class [Domain] Total future minimum lease payments Lessee, Operating Lease, Liability, to be Paid Add: dilutive effect of stock options and restricted stock units (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Changes in operating assets and liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net [Abstract] Gain on exchange of intangible assets, net Gain On Exchange Of Intangible Assets Gain On Exchange Of Intangible Assets All Executive Categories All Executive Categories [Member] Stock repurchased and subsequently retired Stock Repurchased and Retired During Period, Value Operating lease liabilities Increase (Decrease) in Operating Lease Liability Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Plan Name [Domain] Plan Name [Domain] Sales and support Selling and Marketing Expense Right of use assets, net Non-current assets - right of use assets, net Operating Lease, Right-of-Use Asset Stockholders’ Equity Shareholders' Equity and Share-Based Payments [Text Block] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Texas-New Mexico Power Company (“TNMP”) Texas-New Mexico Power Company [Member] Texas-New Mexico Power Company Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Segment Reporting Segment Reporting [Text Block] Minimum Minimum [Member] Lower Colorado River Authority Lower Colorado River Authority [Member] Lower Colorado River Authority [Member] Contract with Customer, Liability [Roll Forward] Contract with Customer, Liability [Roll Forward] Contract with Customer, Liability Expiration Date Trading Arrangement Expiration Date Long Term Collaborative Arrangement, Rights And Obligations, Contingent Consideration, Noncurrent Collaborative Arrangement, Rights And Obligations, Contingent Consideration, Noncurrent Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Weighted-average common shares: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Concentrations of Credit Risk and Significant Customers Concentration Risk Disclosure [Text Block] Agreement term (in years) Collaborative Arrangement, Rights and Obligations, Agreement Term Collaborative Arrangement, Rights and Obligations, Agreement Term Exercise Price Award Exercise Price Stock repurchase program, authorized amount Share Repurchase Program, Authorized, Amount Segment Reporting [Line Items] Segment Reporting [Line Items] Document Quarterly Report Document Quarterly Report Exchanges - licenses surrendered Exchanges - licenses surrendered Indefinite-Lived Intangible Assets, Exchanged Licenses Surrendered Indefinite-Lived Intangible Assets, Exchanged Licenses Surrendered Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Segments [Domain] Segments [Domain] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Balance at the end of period Intangible Asset, Excluding Goodwill, Indefinite-Lived, Including Held-for-Sale Intangible Asset, Excluding Goodwill, Indefinite-Lived, Including Held-for-Sale Equity Component [Domain] Equity Component [Domain] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Escrow deposit, cumulative Escrow Deposit, Cumulative Escrow Deposit, Cumulative Increase in deposit assets Increase (Decrease) in Deposit Assets Operating expenses Costs and Expenses Adoption Date Trading Arrangement Adoption Date Counterparty Name [Domain] Counterparty Name [Domain] Total stockholders’ equity Beginning balance Ending balance Equity, Attributable to Parent Adjusted sales and support Selling And Marketing Expense, Adjusted Selling And Marketing Expense, Adjusted After 2031 Lessee, Operating Lease, Liability, to be Paid, after Year Four Lessee, Operating Lease, Liability, to be Paid, after Year Four ASSETS Assets [Abstract] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Accounting Policies [Abstract] Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Present value of net future minimum lease payments Operating Lease, Liability Insider Trading Policies and Procedures [Line Items] Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Deferred income taxes Deferred Income Tax Expense (Benefit) Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Payments Received Operating Lease, Lease Income Antidilutive securities excluded from computation of earnings per share, amount (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Number of operating segments Number of Operating Segments Noncurrent assets Capitalized Contract Cost, Net, Noncurrent Excise tax expense Excise and Sales Taxes Entity Central Index Key Entity Central Index Key All Adjustments to Compensation All Adjustments to Compensation [Member] Equity [Abstract] Equity [Abstract] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Net cash provided by (used in) operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Income Statement [Abstract] Income Statement [Abstract] Stockholders’ equity Equity, Attributable to Parent [Abstract] Number of states in service territory Collaborative Arrangement, Rights and Obligations, Number Of States In Service Territory Collaborative Arrangement, Rights and Obligations, Number Of States In Service Territory Document Transition Report Document Transition Report Spectrum revenue Spectrum [Member] Spectrum [Member] Operating expenses Operating Expenses [Abstract] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Renewal term, number Lessor, Operating Lease, Renewal Term, Number Lessor, Operating Lease, Renewal Term, Number City Area Code City Area Code All Individuals All Individuals [Member] Name Forgone Recovery, Individual Name Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Intangible Assets Intangible Asset [Text Block] Statement [Line Items] Statement [Line Items] Total assets Assets Exchanges - licenses received Exchanges - licenses received Indefinite-Lived Intangible Assets, Exchanged Licenses Received Indefinite-Lived Intangible Assets, Exchanged Licenses Received Accrued severance and other related charges Increase (Decrease) in Accrued Severance and Other Related Charges Increase (Decrease) in Accrued Severance and Other Related Charges Additional common stock authorized and reserved for future issuance (in shares) Common Stock, Capital Shares Reserved for Future Issuance Schedule of Additional Lease Cost Information Additional Lease, Cost [Table Text Block] Additional Lease, Cost [Table Text Block] Impairment charges Intangible Asset, Excluding Goodwill, Indefinite-Lived, Impairment Loss Schedule of Supplemental Balance Sheet Information Supplemental Lease Information [Table Text Block] Supplemental Lease Information [Table Text Block] Nature of Operations and Basis of Presentation Nature of Operations [Text Block] PEO PEO [Member] Beginning balance (in shares) Ending balance (in shares) Shares, Outstanding Right of use assets Increase (Decrease) in Operating Right of Use Asset Increase (Decrease) in Operating Right of Use Asset Stock compensation expense Share-Based Payment Arrangement, Expense Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Stock option exercises (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Revenue recognized Contract with Customer, Liability, Revenue Recognized Accumulated ‎deficit Retained Earnings [Member] Operating lease liabilities Non-current liabilities - operating lease liabilities Operating Lease, Liability, Noncurrent Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Escrow deposits Escrow deposit, current Escrow Deposit, Current Escrow Deposit, Current Net income per common share diluted (in dollars per share) Earnings Per Share, Diluted Entity Current Reporting Status Entity Current Reporting Status Collaborative Arrangement, Transaction with Party to Collaborative Arrangement Collaborative Arrangement, Transaction with Party to Collaborative Arrangement [Member] Net cash provided by (used in) financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Shares withheld for taxes Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Product development Research and Development Expense Adjustments to reconcile net income to net cash provided by (used in) operating activities Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Schedule of Contract Liabilities Contract with Customer, Contract Liabilities [Table Text Block] Contract with Customer, Contract Liabilities [Table Text Block] Property and equipment, net Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Stock option exercises Stock Issued During Period, Value, Stock Options Exercised Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Underlying Securities Award Underlying Securities Amount Revenue Revenue from Contract with Customer [Text Block] State Income Tax Jurisdiction, Domestic State and Local [Member] Weighted average incremental borrowing rate - operating lease liabilities Operating Lease, Weighted Average Discount Rate, Percent Shares available (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Segment Reporting [Table] Segment Reporting [Table] Initial Term Lessor, Operating Lease, Term of Contract Intangible assets Intangible Asset, Excluding Licenses Classified as Held for Sale Intangible Asset, Excluding Licenses Classified as Held for Sale All Customers Except TECO All Customers Except Tampa Electric Company [Member] All Customers Except Tampa Electric Company Capitalized Contract Costs [Roll Forward] Capitalized Contract Costs [Roll Forward] Capitalized Contract Costs Escrow deposits Escrow Deposit CASH FLOWS FROM INVESTING ACTIVITIES Cash Provided by (Used in) Investing Activity, Continuing Operation [Abstract] Schedule of Total Lease Cost Lease, Cost [Table Text Block] Evergy Services, Inc. (“Evergy”) Evergy Evergy [Member] Evergy [Member] Contingent liability Business Combination, Contingent Consideration, Liability, Current CASH FLOWS FROM OPERATING ACTIVITIES Cash Provided by (Used in) Operating Activity, Continuing Operation [Abstract] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Expected disbursements cost over the next 12 months Restructuring and Related Cost, Expected Cost Remaining Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] (Loss) income from operations Operating Income (Loss) Total Consideration Remaining performance obligation, amount Revenue, Remaining Performance Obligation, Amount Current Fiscal Year End Date Current Fiscal Year End Date Effective income tax rate, percentage Effective Income Tax Rate Reconciliation, Adjusted, Percent Effective Income Tax Rate Reconciliation, Adjusted, Percent Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Broadband license(s) delivered Broadband Licenses Granted, Number Of License Delivered Broadband Licenses Granted, Number Of License Delivered Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Public Utility District No. 1 of Benton County Public Utility District No. 1 of Benton County [Member] Public Utility District No. 1 of Benton County Current Collaborative Arrangement, Rights And Obligations, Contingent Consideration, Current Collaborative Arrangement, Rights And Obligations, Contingent Consideration, Current Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Common stock, shares issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Escrow Deposits Other Assets Disclosure [Text Block] Tampa Electric Company (“TECO”) TECO Tampa Electric Company [Member] Tampa Electric Company Total Consideration Broadband Licenses Granted, Estimated Consideration Broadband Licenses Granted, Estimated Consideration Equity Components [Axis] Equity Components [Axis] Deferred broadband costs Deferred Costs, Noncurrent Product and Service [Domain] Product and Service [Domain] Balance at the beginning of the period Balance at the beginning of the end Capitalized Contract Cost, Net Taxes paid, including excise tax Income Tax Paid, after Refund Received Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Elena Marquez [Member] Elena Marquez Balance at the beginning of the period Balance at the end of the period Restructuring Reserve, Current Entity Interactive Data Current Entity Interactive Data Current Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Deferred income tax Deferred Income Tax Liabilities, Net Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Income Tax Disclosure [Table] Income Tax Disclosure [Table] Income Tax Disclosure [Table] Accounts payable and other accrued expenses Accounts Payable and Accrued Liabilities, Current Entity Small Business Entity Small Business 2030 Lessee, Operating Lease, Liability, to be Paid, Year Three Termination Date Trading Arrangement Termination Date Shares withheld for taxes (in shares) Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Other assets Other Assets, Noncurrent CASH FLOWS FROM FINANCING ACTIVITIES Cash Provided by (Used in) Financing Activity, Continuing Operation [Abstract] Document Type Document Type Fair Value as of Grant Date Award Grant Date Fair Value Schedule of Intangible Asset, Indefinite-Lived Intangible Asset, Indefinite-Lived [Table Text Block] Scott A. Lang [Member] Scott A. Lang Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Stock repurchase program, remaining repurchase amount Share Repurchase Program, Remaining Authorized, Amount Arrangement Duration Trading Arrangement Duration Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Lease [Line Items] Lease [Line Items] Lease [Line Items] Local Phone Number Local Phone Number Deferred revenue Noncurrent liabilities Contract with Customer, Liability, Noncurrent LCRA Expansion Agreement LCRA Expansion Agreement Lower Colorado River Authority (LCRA) Expansion [Member] Lower Colorado River Authority (LCRA) Expansion Deferred tax liability Deferred Tax Liabilities, Gross Schedule of Acquired Indefinite-lived Intangible Assets by Major Class [Table] Intangible Asset, Indefinite-Lived, Acquired [Table] Less amount classified as current assets Capitalized Contract Cost, Net, Current Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Commitments and contingencies (See Note 12) Commitments and Contingencies San Diego Gas & Electric (“SDG&E”) Agreement SDG&E San Diego Gas Electric Company [Member] San Diego Gas & Electric Company [Member] Spectrum revenue Total spectrum revenue Revenues Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Accounts payable and other accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] Lease extension Lessor, Operating Lease, Renewal Term Deferred gain on sale of intangible assets Deferred Gain On Sale Of Intangible Assets, Cumulative Deferred Gain On Sale Of Intangible Assets, Cumulative Additions Capitalized Contract Cost, Additions Capitalized Contract Cost, Additions Counterparty Name [Axis] Counterparty Name [Axis] LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities and Equity [Abstract] Other Commitments [Table] Other Commitments [Table] All Award Types Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount 2027 (excluding the three months ended June 30, 2026) Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION Supplemental Cash Flow Information [Abstract] PEO Name PEO Name Benton County (“Benton PUD”) Benton County [Member] Benton County Payments Received Balance at the beginning of the period Balance at the end of the period Contract with customer, liability Contract with Customer, Liability Total Consideration Payments Remaining Lessor, Operating Lease, Payment to be Received Other segment items Segment Reporting, Other Segment Item, Amount Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Schedule of Spectrum Sale Agreements Collaborative Arrangement and Arrangement Other than Collaborative [Table Text Block] Other Commitments [Line Items] Other Commitments [Line Items] Customer credit Collaborative Arrangement, Rights And Obligations, Customer Credit Collaborative Arrangement, Rights And Obligations, Customer Credit Cash payments Payments for Restructuring Cash and cash equivalents and restricted cash at beginning of the period Cash and cash equivalents and restricted cash at end of the period Total cash and cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] Broadband licenses held for sale Less: licenses classified as held for sale Disposal Group, Including Discontinued Operation, Intangible Assets, Current Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Total operating lease cost Lease, Cost Payments Received Broadband Licenses Granted, Payment Received Broadband Licenses Granted, Payment Received Related party transactions Related Party Transaction, Amounts of Transaction Customer [Domain] Customer [Domain] Leases Lessee, Operating Leases [Text Block] Net income per common share basic (in dollars per share) Earnings Per Share, Basic Deferred revenue Less amount classified as current liabilities Contract with Customer, Liability, Current Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Acquired Indefinite-lived Intangible Assets [Line Items] Intangible Asset, Indefinite-Lived, Acquired [Line Items] Award Type Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Federal and state Federal And State Jurisdiction [Member] Federal and state jurisdiction. Accumulated deficit Retained Earnings (Accumulated Deficit) Restructuring and Related Activities [Abstract] Product and Service [Axis] Product and Service [Axis] Contingent liability Decrease in contingent liability Business Combination, Contingent Consideration, Change in Contingent Consideration, Liability, Increase (Decrease) Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common ‎stock Common Stock [Member] Contingent liability Business Combination, Contingent Consideration, Liability Ameren Corporation (“Ameren”) Ameren Ameren Corporation [Member] Ameren Corporation [Member] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Concentration risk, percentage Concentration Risk, Percentage Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Adjusted product development Research And Development Expense, Adjusted Research And Development Expense, Adjusted Equity Awards Adjustments Equity Awards Adjustments [Member] Reportable Segment Reportable Segment [Member] Reportable Segment Capitalized change in estimated asset retirement obligations Asset Retirement Obligation, Capitalized Change In Estimate Asset Retirement Obligation, Capitalized Change In Estimate Total liabilities and stockholders’ equity Liabilities and Equity Interest income Interest Income, Other Employee Stock Option Share-Based Payment Arrangement, Option [Member] Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Plan Name [Axis] Plan Name [Axis] Severance and other related charges Cash accruals Restructuring Charges Income Tax Authority [Domain] Income Tax Jurisdiction [Domain] Tabular List, Table Tabular List [Table Text Block] Additional paid-in capital Additional Paid in Capital Other liabilities Increase (Decrease) in Other Noncurrent Liabilities Purchases of intangible assets and other related costs Payments to acquire intangible assets Payments to Acquire Intangible Assets Other income Other Nonoperating Income (Expense) Name Awards Close in Time to MNPI Disclosures, Individual Name Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] General and administrative General and Administrative Expense Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Preferred stock, $0.0001 par value per share, 10,000,000 shares authorized and no shares outstanding at June 30, 2026 and March 31, 2026 Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] Spectrum receivable Spectrum Receivable Costs, Current Spectrum Receivable Costs, Current Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Accrued Severance and Other Related Charges Restructuring and Related Activities Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Income Tax Authority [Axis] Income Tax Jurisdiction [Axis] Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Pay vs Performance Disclosure [Line Items] Contingencies and Guaranty Commitments Disclosure [Text Block] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Additional ‎paid-in ‎capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Indefinite-lived Intangible Assets [Axis] Intangible Asset, Indefinite-Lived, Class [Axis] Proceeds from sale of spectrum Proceeds from Sale of Intangible Assets Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and Cash Equivalent Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Company Selected Measure Amount Company Selected Measure Amount Depreciation and amortization Depreciation, Depletion and Amortization Entity Address, Address Line Two Entity Address, Address Line Two Oncor Electric Delivery Company LLC Oncor Electric Delivery Company LLC [Member] Oncor Electric Delivery Company LLC Current assets Assets, Current [Abstract] Weighted average term - operating lease liabilities Operating Lease, Weighted Average Remaining Lease Term Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Right of use assets new leases Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Income tax expense (benefit) Income tax expense (benefit) Income Tax Expense (Benefit) Risks and Uncertainties [Abstract] Risks and Uncertainties [Abstract] Customer Concentration Risk Customer Concentration Risk [Member] Award Timing Method Award Timing Method [Text Block] Basis of Presentation and Use of Estimates Consolidation, Policy [Policy Text Block] Net change in cash and cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Net income Net income Net income Net income: Net Income (Loss) Attributable to Parent Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Statement [Table] Statement [Table] Restatement Determination Date: Restatement Determination Date [Axis] Proceeds from stock option exercises Proceeds from Stock Options Exercised Lease [Table] Lease [Table] Lease [Table] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]