Fair Value Measurements (Details) - EBP 003 - USD ($)	Dec. 31, 2025	Dec. 31, 2024
EBP, Investment, Fair Value and NAV [Line Items]
Total investments, at fair value	$ 758,372,364	$ 696,293,521
Level 1
EBP, Investment, Fair Value and NAV [Line Items]
Total investments, at fair value	758,372,364	696,293,521
Mutual funds
EBP, Investment, Fair Value and NAV [Line Items]
Total investments, at fair value	677,271,672	615,420,141
Mutual funds \| Level 1
EBP, Investment, Fair Value and NAV [Line Items]
Total investments, at fair value	677,271,672	615,420,141
Common collective trusts
EBP, Investment, Fair Value and NAV [Line Items]
Total investments, at fair value	66,861,438	67,933,158
Common collective trusts \| Level 1
EBP, Investment, Fair Value and NAV [Line Items]
Total investments, at fair value	66,861,438	67,933,158
MSC Industrial Direct Co., Inc. Class A Common Stock
EBP, Investment, Fair Value and NAV [Line Items]
Total investments, at fair value	14,239,254	12,940,222
MSC Industrial Direct Co., Inc. Class A Common Stock \| Level 1
EBP, Investment, Fair Value and NAV [Line Items]
Total investments, at fair value	$ 14,239,254	$ 12,940,222

Fair value of investment, excluding plan interest in master trust, held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Includes, but is not limited to, derivative, investment measured at net asset value per share as practical expedient, and insurance contract not meeting fully-benefit responsive investment criteria.

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+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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