Long Lived Assets by Geographic Area (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2014	Sep. 29, 2013	Sep. 30, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 148,712	$ 125,158	$ 116,146
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	117,867	100,736	93,496
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	12,167	12,558	13,253
Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	16,766	10,209	7,912
Other Geographic Area [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 1,912	$ 1,655	$ 1,485