Supplemental Cash Flow Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 28, 2012	Dec. 30, 2011
Supplemental Cash Flow Information [Line Items]
Interest paid	$ 1,329
Income taxes paid, net of refunds received	125	41
Purchase of property and equipment on account	47	264
License of intellectual property on account	23	4,428
Leasehold improvements paid by landlord	$ 805