License Fee Income - Additional Information (Detail) - USD ($) $ in Thousands			3 Months Ended		6 Months Ended
	Jan. 04, 2018	Dec. 22, 2017	Mar. 30, 2018	Mar. 31, 2017	Mar. 30, 2018	Mar. 31, 2017
Revenues [Abstract]
License income from third party	$ 4,500	$ 3,000	$ 2,268	$ 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%