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Commitments and Contingencies - Additional Information (Details) - USD ($)	Nov. 04, 2019	Mar. 31, 2025
Commitments Disclosure [Line Items]
Outstanding letters of credit and bonds		$ 28,600,000
Settlement offer per eligible plaintiff who has already filed a lawsuit	$ 700
Settlement offer per eligible plaintiff who has not already filed a lawsuit	$ 300

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- Definition

Commitments Disclosure [Line Items]

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No definition available.

+ Details

Name:	fss_CommitmentsDisclosureLineItems
Namespace Prefix:	fss_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Settlement offer amount to each firefighter who has already filed a lawsuit and is eligible to be part of the settlement.

+ References

No definition available.

+ Details

Name:	fss_SettlementOfferPerEligiblePlaintiffWhoHasAlreadyFiledALawsuit
Namespace Prefix:	fss_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Settlement offer amount to each firefighter who has not filed a case and is eligible to be part of the settlement.

+ References

No definition available.

+ Details

Name:	fss_SettlementOfferPerEligiblePlaintiffWhoHasNotAlreadyFiledALawsuit
Namespace Prefix:	fss_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant