Allowance for Doubtful Accounts - Schedule of Allowance for Doubtful Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 29, 2012
Receivables [Abstract]
Balances at Beginning of Period	$ 21,158	$ 18,574	$ 15,590
Charged/ (Credited) to Costs and Expenses	8,988	4,373	5,291
Asset Write-Offs, Less Recoveries	(4,934)	(1,789)	(2,307)
Balances at End of Period	$ 25,212	$ 21,158	$ 18,574