v2.4.0.6
Share-Based Compensation - Summary of Restricted Stock and Units Activity (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Dec. 28, 2012
Components Of Salaries And Benefits [Line Items]  
Number of Shares, Unvested - Beginning Balance 582
Number of Shares, Granted 191
Number of Shares, Vested (20)
Number of Shares, Forfeited, canceled or expired (5)
Number of Shares, Issued and unvested - Ending Balance 748
Number of Shares, Shares expected to vest - December 28, 2012 698
Weighted-Average Remaining Contractual Term (in years), Unvested-September 28, 2012 2 years 10 months 24 days
Weighted-Average Remaining Contractual Term (in years), Issued and unvested-December 28, 2012 2 years 9 months 18 days
Weighted- Average Remaining Contractual Term (in years), Shares expected to vest-December 28, 2012 2 years 9 months 18 days
Aggregate Intrinsic Value, Unvested - Beginning Balance $ 7,391
Aggregate Intrinsic Value, Issued and unvested - Ending Balance 11,171
Aggregate Intrinsic Value, Shares expected to vest-December 28, 2012 $ 10,426