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Stock Compensation - Assumptions Used in Determination of Grant Date Fair Values Using Black-Scholes Option Pricing Model (Detail)
12 Months Ended
Sep. 30, 2012
Sep. 30, 2010
HGI [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate   2.60%
Expected option term 6 years 6 years
Volatility   32.00%
HGI [Member] | Minimum [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate 0.97%  
Volatility 33.00%  
HGI [Member] | Maximum [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate 1.19%  
Volatility 35.50%  
FGL [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate 0.80%  
Assumed dividend yield 10.00%  
Expected option term 4 years 6 months  
Volatility 35.00%