Entity tax identification number Entity Tax Identification Number Rollovers EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Maximum Maximum [Member] Forfeited nonvested account, decrease from plan expenses EBP, Forfeited Nonvested Account, Decrease from Administrative Expense Legal Entity [Axis] Legal Entity [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] EBP, Description of Plan [Table] EBP, Description of Plan [Table] Mutual funds Mutual Fund [Member] Employer Contribution, 50% EBP, Employer Contribution, Tranche Two [Member] EBP, Employer Contribution, Tranche Two Total Fully Corrected Under VFCP and PTE 2002-51 EBP, Schedule of Delinquent Participant Contribution, Corrected Subsequent Event Subsequent Event [Member] Selling price EBP, Investment Sold, Excluding Plan Interest in Master Trust, Selling Price EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Table] Pretax, maximum annual compensation to total compensation EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage Self-directed brokerage account EBP, Self-Directed Brokerage Account [Member] Total deductions EBP, Change in Net Asset Available for Benefit, Decrease Maximum borrowing amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount Requisite service period EBP, Requisite Service Period EBP, Requisite Service Period Fair Value Measurements EBP, Investment, Fair Value and NAV [Text Block] Minimum borrowing amount EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount Investments, at fair value (Notes 2 and 3) Investments at fair value EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Involuntary cash-out limit EBP, Involuntary Cash-out Limit EBP, Involuntary Cash-out Limit Subsequent Event Type [Domain] Subsequent Event Type [Domain] Money Market Funds Money Market Funds [Member] Level 1 Fair Value, Inputs, Level 1 [Member] EBP, Investment, Fair Value and NAV [Abstract] Statistical Measurement [Axis] Statistical Measurement [Axis] Additions: EBP, Change in Net Asset Available for Benefit, Increase [Abstract] EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Table] Payment to benefits EBP, Payment to Participant [Policy Text Block] Asset transfers in from other plans (Note 1) Assets transferred to the plan EBP, Change in Net Asset Available for Benefit, Transfer to (from) Plan Automatic deferral rate, annual increase EBP, Participant Contribution, Automatic, Annual Increase Deferral Rate EBP, Participant Contribution, Automatic, Annual Increase Deferral Rate Amendment Flag Amendment Flag Basis of accounting EBP, Basis of Accounting [Policy Text Block] EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Table] Investment, number of shares (in shares) EBP, Investment, Number of Shares EBP, Description of Plan and Accounting Change [Abstract] Receivables EBP, Receivable [Abstract] EBP, Investment, Fair Value and NAV EBP, Investment, Fair Value and NAV [Table Text Block] Investment in loans, number of shares (in shares) EBP, Investment, Participant Loan, Number Of Shares EBP, Investment, Participant Loan, Number Of Shares Investments [Domain] Investments [Domain] EBP, Schedule of Delinquent Participant Contribution [Abstract] EBP, Employer Contribution [Domain] EBP, Employer Contribution [Domain] EBP, Employer Contribution [Domain] Use of estimates EBP, Use of Estimate [Policy Text Block] Schedule H, Line 4i – Schedule of Assets (Held At End of Year) EBP, Schedule of Asset Held for Investment [Text Block] Cover [Abstract] Risks and Uncertainties EBP, Risk and Uncertainty [Text Block] Employer EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash EBP, Schedule of Delinquent Participant Contribution [Line Items] EBP, Schedule of Delinquent Participant Contribution [Line Items] Minimum Minimum [Member] Investment Type [Axis] Investment Type [Axis] Interest income on notes receivable from participants EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Total contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution Nonexempt Transactions EBP, Nonexempt Transactions [Text Block] EBP, Nonexempt Transactions Participants EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover Net appreciation in fair value of investments EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment Interest and dividend income EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment EBP, Description of Plan [Line Items] EBP, Description of Plan [Line Items] Plan number EBP, Plan Number EBP, Investment, Fair Value and NAV [Line Items] EBP, Investment, Fair Value and NAV [Line Items] Description of the Plan EBP, Description of Plan [Text Block] Contributions Pending Correction in VFCP EBP, Schedule of Delinquent Participant Contribution, Pending Correction in VFCP EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Schedule of Asset Held for Investment [Line Items] EBP, Schedule of Asset Held for Investment [Line Items] Compass Minerals common stock EBP, Employer, Common Stock [Member] EBP, Schedule of Asset Held for Investment [Abstract] Employer contribution vesting service period EBP, Employer Contribution Vesting Service Period EBP, Employer Contribution Vesting Service Period EBP, Accounting Policy [Table] EBP, Accounting Policy [Table] Total additions EBP, Change in Net Asset Available for Benefit, Increase Allowance for credit loss EBP, Note Receivable from Participant, Allowance for Credit Loss True-up contribution EBP, Forfeited Nonvested Account, Decrease from Employer Contribution, True-Up Contribution EBP, Forfeited Nonvested Account, Decrease from Employer Contribution, True-Up Contribution Contributions: EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] Investment, Identifier [Axis] Investment, Identifier [Axis] Administrative expenses EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense EBP, Asset Held for Investment EBP, Asset Held for Investment Document Information [Line Items] Document Information [Line Items] EBP, Employer Contribution [Axis] EBP, Employer Contribution [Axis] EBP, Employer Contribution EBP, Risk and Uncertainty [Line Items] EBP, Risk and Uncertainty [Line Items] EBP, Risk and Uncertainty [Table] EBP, Risk and Uncertainty [Table] Participant compensation matched EBP, Employer Contribution, Participant Compensation Matched, Percentage EBP, Statement of Change in Net Asset Available for Benefit [Abstract] Level 2 Fair Value, Inputs, Level 2 [Member] Account balance, automatically rolled into investment retirement account EBP, Payment Of Benefit, Account Balance, Automatically Rolled Into Investment Retirement Account EBP, Payment Of Benefit, Account Balance, Automatically Rolled Into Investment Retirement Account Contributions Corrected Outside VFCP EBP, Schedule of Delinquent Participant Contribution, Corrected Outside VFCP Subsequent Event Type [Axis] Subsequent Event Type [Axis] EBP, Tax Status [Table] EBP, Tax Status [Table] Net increase EBP, Change in Net Asset Available for Benefit, Increase (Decrease) Related Parties and Parties-In-Interest Transactions EBP, Related Party and Party-in-Interest Transactions [Text Block] EBP, Related Party and Party-in-Interest Transactions [Abstract] EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] Total receivables EBP, Receivable Employer contributions EBP, Employer Contribution, Receivable Automatic deferral rate EBP, Participant Contribution, Automatic, Deferral Rate Employee contribution, after-tax EBP, Employee Contribution, After-Tax, Percentage EBP, Employee Contribution, After-Tax, Percentage Benefits paid to participants EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Current Value EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Amount of late remittances Participant Contributions Transferred Late to Plan EBP, Schedule of Delinquent Participant Contribution, Transferred Late to Plan Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Minimum for lump sum distribution EBP, Minimum Balance For Lump Sum Distribution EBP, Minimum Balance For Lump Sum Distribution Dividend declared and paid (in dollars per share) EBP, Dividend Declared EBP, Dividend Declared Term, residential loan EBP, Note Receivable From Participant, Account, Primary Residence, Maximum Borrowing Term EBP, Note Receivable From Participant, Account, Primary Residence, Maximum Borrowing Term EBP, Statement of Net Asset Available for Benefit [Abstract] EBP, Accounting Policy [Line Items] EBP, Accounting Policy [Line Items] EBP, Tax Status [Abstract] Stock Purchase Account Stock Purchase Account [Member] Stock Purchase Account PIMCO EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Investment valuation and income recognition EBP, Investment [Policy Text Block] Document Type Document Type EBP 001 EBP 001 [Member] EBP 001 Plan Termination EBP, Plan Termination [Text Block] Entity Central Index Key Entity Central Index Key Lost earnings on late remittances EBP, Delinquent Participant Contributions, Lost Earnings EBP, Delinquent Participant Contributions, Lost Earnings Participant loan interest rate EBP, Asset Held for Investment, Participant Loan, Interest Rate Common collective trusts Common Collective Trust [Member] EBP, Risk and Uncertainty [Abstract] EBP, Tax Status [Line Items] EBP, Tax Status [Line Items] Employer contribution vesting percentage EBP, Employer Contribution Vesting Percentage EBP, Employer Contribution Vesting Percentage EBP, Subsequent Event [Table] EBP, Subsequent Event [Table] Deductions: EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Forfeited nonvested account, decrease from employer contributions EBP, Forfeited Nonvested Account, Decrease from Employer Contribution Notes receivable from participants EBP, Note Receivable from Participant Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Significant Accounting Policies EBP, Summary of Accounting Policy [Text Block] Entity Registrant Name Entity Registrant Name Discretionary employer contribution EBP, Employer Contribution, Discretionary EBP, Employer Contribution, Discretionary Cost of asset EBP, Investment Acquired, Excluding Plan Interest in Master Trust, Cost EBP, Subsequent Event [Abstract] Subsequent Events EBP, Subsequent Event [Text Block] EBP, Schedule of Delinquent Participant Contribution EBP, Schedule of Delinquent Participant Contribution [Text Block] EBP, Schedule of Delinquent Participant Contribution [Table] EBP, Schedule of Delinquent Participant Contribution [Table] Money market funds EBP, Reclassifications [Policy Text Block] EBP, Reclassifications Income Tax EBP, Tax Status [Text Block] Maximum borrowing, to total account, percentage EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage Matching contribution offset EBP, Forfeited Nonvested Account, Decrease from Employer Contribution, Matching Contribution Offset EBP, Forfeited Nonvested Account, Decrease from Employer Contribution, Matching Contribution Offset EBP, Subsequent Event [Line Items] EBP, Subsequent Event [Line Items] Document Information [Table] Document Information [Table] Notes receivable from participant EBP, Note Receivable from Participant [Policy Text Block] Net investment income EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment EBP, Related Party and Party-in-Interest Transactions [Line Items] EBP, Related Party and Party-in-Interest Transactions [Line Items] Level 3 Fair Value, Inputs, Level 3 [Member] Contributions Not Corrected EBP, Schedule of Delinquent Participant Contribution, Not Corrected Term, general purpose loan EBP, Note Receivable From Participant, General Loan, Term EBP, Note Receivable From Participant, General Loan, Term Net assets available for benefits Net assets available for benefits at beginning of year Net assets available for benefits at end of year EBP, Net Asset Available for Benefit Entity [Domain] Entity [Domain] Investment income: EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Forfeited, nonvested account balance EBP, Forfeited Nonvested Account Employer matching contribution EBP, Employer Contribution, Matching Percentage Employer Contribution, 100% EBP, Employer Contribution, Tranche One [Member] EBP, Employer Contribution, Tranche One EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Table] EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Line Items]