Noncontrolling Interest, Ownership Percentage Purchased

No definition available.

Name:	msa_NoncontrollingInterestOwnershipPercentagePurchased
Namespace Prefix:	msa_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Payments to Acquire Additional Interest in Subsidiaries, Dividend

+ References

No definition available.

+ Details

Name:	msa_PaymentsToAcquireAdditionalInterestInSubsidiariesDividend
Namespace Prefix:	msa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460

+ Details

Name:	us-gaap_BusinessCombinationAcquisitionRelatedCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow associated with the purchase of noncontrolling interest during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585

+ Details

Name:	us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

+ Details

Name:	us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_BusinessAcquisitionAxis=msa_BacharachIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Subsequent Events (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended	6 Months Ended
Subsequent Events (Details) - USD ($) $ in Thousands	Jul. 01, 2021	Jul. 29, 2021	Jun. 30, 2021	Jun. 30, 2021	Jun. 30, 2020
Subsequent Event [Line Items]
Acquisition, net of cash acquired				$ 62,992	$ 0
Bacharach Inc
Subsequent Event [Line Items]
Transaction costs			$ 1,900
Subsequent Event
Subsequent Event [Line Items]
Noncontrolling interest, ownership percentage purchased	10.00%
Payments to acquire additional interest in subsidiary		$ 19,000
Dividend payment to subsidiary		$ 6,000
Subsequent Event \| Bacharach Inc
Subsequent Event [Line Items]
Acquisition, net of cash acquired	$ 337,000