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Stock Compensation - Assumptions Used in Determination of Grant Date Fair Values Using Black-Scholes Option Pricing Model (Detail) (HGI [Member])
3 Months Ended
Dec. 30, 2012
Jan. 01, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate 0.84% 1.19%
Assumed dividend yield 0.00% 0.00%
Expected option term   6 years
Volatility   33.00%
Minimum [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected option term 5 years 3 months 18 days  
Volatility 42.80%  
Maximum [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected option term 6 years  
Volatility 44.00%