v2.4.0.6
Share-Based Compensation - Summary of Stock Option Activity (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Dec. 28, 2012
Schedule Of Stock Options [Line Items]  
Number of Shares, Outstanding - Beginning Balance 1,861
Number of Shares, Exercised (138)
Number of Shares, Forfeited, canceled or expired (271)
Number of Shares, Outstanding - Ending Balance 1,452
Number of Shares, Options vested and expected to vest as of December 28, 2012 1,347
Number of Shares, Options vested and exercisable as of December 28, 2012 814
Weighted-Average Exercise Price Per Share, Outstanding - Beginning Balance $ 1.23
Weighted-Average Exercise Price Per Share, Exercised $ 1.13
Weighted-Average Exercise Price Per Share, Forfeited, canceled or expired $ 0.64
Weighted-Average Exercise Price Per Share, Outstanding - Ending Balance $ 1.34
Weighted-Average Exercise Price Per Share, Options vested and expected to vest as of December 28, 2012 $ 1.40
Weighted-Average Exercise Price Per Share, Options vested and exercisable as of December 28, 2012 $ 1.26
Weighted-Average Remaining Contractual Term (in years), Beginning Balance 7 years 1 month 6 days
Weighted-Average Remaining Contractual Term (in years), Ending Balance 6 years 9 months 18 days
Weighted-Average Remaining Contractual Term (in years), Options vested and expected to vest as of December 28, 2012 6 years 9 months 18 days
Weighted-Average Remaining Contractual Term (in years), Options vested and exercisable as of December 28, 2012 6 years 9 months 18 days
Aggregate Intrinsic Value, Beginning Balance $ 21,352
Aggregate Intrinsic Value, Ending Balance 19,734
Aggregate Intrinsic Value, Options vested and expected to vest as of December 28, 2012 18,234
Aggregate Intrinsic Value, Options vested and exercisable as of December 28, 2012 $ 11,124