Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended
	Apr. 01, 2016	Oct. 02, 2015	Mar. 05, 2014	Jul. 26, 2013
Commitments And Contingencies Disclosure [Abstract]
Environmental Exit Costs, Assets Previously Disposed, Liability for Remediation	$ 0.8	$ 1.6
Consent agreement term	The Consent Agreement has a three-year term and provided for: (i) a payment of $20 million, $10 million of which is suspended and eligible for offset credit based on verified expenditures for past and future remedial compliance measures; (ii) the appointment of an external Special Compliance Official to oversee compliance with the Consent Agreement and the ITAR; (iii) two external audits of the Company’s ITAR compliance program; and (iv) continued
Total penalty proposed by DDTC Office of Compliance			$ 20.0
Penalty suspended and eligible for offset credit			$ 10.0
Estimated and recorded charge				$ 10.0
Paid and Recorded in March 2014				4.0
Paid and Recorded in February 2015				2.0
Paid and Recorded in March 2016				2.0
Estimated and to be paid March 2017				$ 2.0
Investment in remedial compliance measures	$ 5.0
Expected investment in remedial compliance measures	$ 15.0