License Fee Income - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended
	Dec. 22, 2017	Dec. 29, 2017	Dec. 30, 2016
Revenues [Abstract]
License income from third party	$ 3,000	$ 3,025	$ 0
Inventory and manufacturing equipment sold	$ 1,000
Royalty percentage on sale of licensed product		15.00%