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Commitments and Contingencies - Additional Information (Details) - USD ($) | Nov. 04, 2019 | Mar. 31, 2025
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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] + References No definition available. + Details
Name: | fss_CommitmentsDisclosureLineItems
Namespace Prefix: | fss_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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

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- 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