Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Jul. 01, 2016	Oct. 02, 2015	Mar. 05, 2014
Commitments And Contingencies Disclosure [Abstract]
Environmental Exit Costs, Assets Previously Disposed, Liability for Remediation	$ 0.7	$ 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		$ 20.0
Penalty suspended and eligible for offset credit	10.0		$ 10.0
Estimated and recorded charge	10.0
Paid and recorded over fiscal years 2014, 2015 and 2016	8.0
Estimated and to be paid March 2017	2.0
Penalty suspended and approved for offset credit	$ 10.0