Schedule of Effective Income Tax Rate (Detail)	12 Months Ended
	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
Income Tax Disclosure [Abstract]
Federal statutory income tax rate	35.00%	35.00%	35.00%
State and local taxes, net of federal tax benefit	0.80%	1.30%	1.30%
Non-U.S. income taxed at different rates, net	(5.20%)	(5.60%)	(5.90%)
Resolution of tax contingencies due to lapses of statutes of limitations	(1.20%)	(1.20%)	(1.80%)
Other	0.30%	(1.10%)	(0.30%)
Effective tax rate	29.70%	28.40%	28.30%