Allowance for Doubtful Accounts (Detail) - USD ($) $ in Thousands		11 Months Ended	12 Months Ended
		Oct. 02, 2015	Sep. 29, 2017	Sep. 30, 2016
Accounts Notes Loans And Financing Receivable Gross Allowance And Net [Abstract]
Balance at Beginning of Year		$ 10,023	$ 17,028	$ 10,050
Charged to expense		1,502	1,647	9,690
Other	[1]	378	0	0
Write-offs		(1,853)	(2,640)	(2,712)
Balance at End of Year		$ 10,050	$ 16,035	$ 17,028

[1] Other includes balances acquired and balances reclassified to assets held for sale.