Employee Benefit Plan, Related-Party and Party-in-Interest Transactions - WESCO DISTRIBUTION, INC. RETIREMENT SAVINGS PLAN - USD ($) |
12 Months Ended | |
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Dec. 31, 2025 |
Dec. 31, 2024 |
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| EBP, Related Party and Party-in-Interest Transactions [Abstract] | ||
| EBP, Related Party and Party-in-Interest Transactions | Related Party and Party-In-Interest Transactions The Plan invests in certain mutual funds that are managed by Fidelity, the Plan's trustee. Transactions involving Fidelity funds qualify as party-in-interest. WESCO International, Inc. owns 100% of WESCO Distribution, Inc., the Plan Sponsor. The Plan held shares of the Wesco Stock Fund, which holds shares of common stock of WESCO International, Inc. as of December 31, 2025 and 2024. Therefore, transactions with this investment qualify as party-in-interest. Disbursements from the Wesco Stock Fund were approximately $0.8 million and $1.4 million for the years ended December 31, 2025 and 2024, respectively. Transfers out of the Wesco Stock Fund were approximately $0.2 million and $1.3 million for the years ended December 31, 2025 and 2024, respectively.
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| EBP, Change in Net Asset Available for Benefit, Transfer to (from) Plan | $ 24,307,559 | $ (13,774,178) |
| EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment | 20,073,602 | 16,461,650 |
| EBP, Related Party and Party-in-Interest Transactions [Line Items] | ||
| EBP, Change in Net Asset Available for Benefit, Transfer to (from) Plan | 24,307,559 | (13,774,178) |
| EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment | $ 20,073,602 | 16,461,650 |
| EBP, Related Party and Party-in-Interest Transactions | Related Party and Party-In-Interest Transactions The Plan invests in certain mutual funds that are managed by Fidelity, the Plan's trustee. Transactions involving Fidelity funds qualify as party-in-interest. WESCO International, Inc. owns 100% of WESCO Distribution, Inc., the Plan Sponsor. The Plan held shares of the Wesco Stock Fund, which holds shares of common stock of WESCO International, Inc. as of December 31, 2025 and 2024. Therefore, transactions with this investment qualify as party-in-interest. Disbursements from the Wesco Stock Fund were approximately $0.8 million and $1.4 million for the years ended December 31, 2025 and 2024, respectively. Transfers out of the Wesco Stock Fund were approximately $0.2 million and $1.3 million for the years ended December 31, 2025 and 2024, respectively.
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| Wesco Stock Fund | ||
| EBP, Related Party and Party-in-Interest Transactions [Abstract] | ||
| EBP, Investment, Disbursements | $ 800,000 | 1,400,000 |
| EBP, Change in Net Asset Available for Benefit, Transfer to (from) Plan | 200,000 | 1,300,000 |
| EBP, Related Party and Party-in-Interest Transactions [Line Items] | ||
| EBP, Investment, Disbursements | 800,000 | 1,400,000 |
| EBP, Change in Net Asset Available for Benefit, Transfer to (from) Plan | $ 200,000 | $ 1,300,000 |