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Restructuring - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012	Mar. 31, 2012
Restructuring Cost and Reserve [Line Items]
Severance costs	$ 1.2us-gaap_SeveranceCosts1	$ 0.6us-gaap_SeveranceCosts1
Released remaining restructuring cost		0.6fss_ReleasedofRestructuringCosts
2012 Plan
Restructuring Cost and Reserve [Line Items]
Severance costs			0.6	0.9
Safety And Security Systems \| 2013 Plan
Restructuring Cost and Reserve [Line Items]
Severance costs	1.2
Corporate, Non-Segment [Member] \| 2013 Plan
Restructuring Cost and Reserve [Line Items]
Severance costs	$ 0.3

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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