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Weighted Average Assumptions Utilized to Value Stock Options (Detail) (USD $)
3 Months Ended 9 Months Ended
Jun. 23, 2012
Jun. 25, 2011
Jun. 23, 2012
Jun. 25, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Risk-free interest rate 0.70% 1.00% 0.70% 1.00%
Expected volatility 47.00% 45.00% 47.00% 45.00%
Expected life (in years) 4 years 3 months 18 days 4 years 3 months 18 days 4 years 3 months 18 days 4 years 2 months 12 days
Dividend yield            
Weighted average fair value of options granted $ 7.10 $ 7.96 $ 6.43 $ 6.23