Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2017	Jul. 01, 2016	Jun. 30, 2017	Jul. 01, 2016	Sep. 30, 2016	Mar. 05, 2014
Commitments And Contingencies Disclosure [Abstract]
Consent agreement term			The Consent Agreement has a three-year term and provides 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						$ 20,000
Penalty suspended and eligible for offset credit						$ 10,000
Estimated and recorded charge	$ 10,000		$ 10,000
Paid and recorded over fiscal years 2014, 2015, and 2016	8,000		8,000
Remaining amount paid in February 2017	2,000		2,000
Penalty suspended and approved for offset credit	10,000		10,000
Insurance recovery received	$ 0	$ 0	$ 7,789	$ 0	$ 5,000