License Fee Income - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended			9 Months Ended
	Jan. 31, 2018	Dec. 29, 2017	Jun. 29, 2018	Mar. 30, 2018	Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017
Revenues [Abstract]
License income from third party	$ 4,500	$ 3,000	$ 0		$ 0	$ 5,293	$ 0
Inventory sold	$ 400
License fee income net of intangible assets write-off				$ 2,300
Write-off intangible assets, net				$ 2,200
Inventory and manufacturing equipment sold		$ 1,000
Royalty percentage on sale of licensed product						15.00%