Intangible Assets - Summary of Amortization Expense of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 28, 2012	Dec. 30, 2011
Schedule Of Amortization Expenses Recognized [Line Items]
Total	$ 789	$ 640
Cost of revenue [Member]
Schedule Of Amortization Expenses Recognized [Line Items]
Total	474	382
Selling, general and administrative [Member]
Schedule Of Amortization Expenses Recognized [Line Items]
Total	$ 315	$ 258

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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