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Acquisitions - Narrative (Details) $ in Millions	Oct. 04, 2021 USD ($)
Ground Force
Business Acquisition [Line Items]
Purchase price, inclusive of preliminary closing adjustments	$ 43.1

X

- Definition

Acquisition purchase price, inclusive of preliminary closing adjustments.

+ References

No definition available.

+ Details

Name:	fss_PurchasePriceInclusiveOfPreliminaryClosingAdjustments
Namespace Prefix:	fss_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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.

+ References

No definition available.

+ Details

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

X

- Details

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