Valuation and Qualifying Accounts - Schedule II Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Oct. 02, 2015	Sep. 26, 2014	Sep. 27, 2013
Allowance for doubtful accounts receivable
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 20,317	$ 14,735	$ 14,386
Charged to Bad Debt Expense	1,123	7,150	5,984
Write-offs Adjustments Charged to Allowance	(222)	(1,568)	(5,635)
Balance at End of Period	21,218	20,317	14,735
Valuation allowance for deferred tax assets
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	67,468	60,704	45,751
Increases	4,666	8,319	14,953
Deductions	(2,450)	(1,555)	0
Balance at End of Period	$ 69,684	$ 67,468	$ 60,704