Cash and Cash Equivalents (Details) $ in Thousands	Sep. 30, 2021 USD ($)
Cash and Cash Equivalents [Abstract]
Gross cash pool position	$ 22,508
Less: cash pool borrowings	(22,000)
Net cash pool position	$ 508

Cash Balance, Collateral, Obligation to Return Cash

No definition available.

Name:	msa_CashBalanceCollateralObligationToReturnCash
Namespace Prefix:	msa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant