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Stock Compensation - Additional Information (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Sep. 30, 2012
Y
Sep. 30, 2011
Sep. 30, 2010
Oct. 21, 2010
Jun. 16, 2010
Stock Based Compensation [Line Items]          
Granted, Options 207        
Exercise of stock options, Shares 1,797        
Option to purchase common stock, outstanding 10        
Exercised, weighted average exercise price $ 6.50        
Shares available for issuance under plan 13,865        
Stock option awards grant date total fair value $ 8,245        
Share-based compensation arrangement by share-based payment award, number of shares authorized       4,626 600
Total unrecognized compensation cost expected to be recognized 6,435        
Unrecognized compensation cost expected to be recognized, years 2.7        
Weighted average remaining contractual term of outstanding stock option awards 9 years 4 months 24 days        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 3,333        
Granted, Shares 863 1,674 939    
Dividend equivalent vesting provision 504        
Compensation cost related to non-vested awards 464        
Weighted average period of non-vested awards 2 years 1 month 6 days        
Minimum [Member]
         
Stock Based Compensation [Line Items]          
Vesting period 7 months        
Time-based and vest over period of restricted stock units 1 year 1 year      
Maximum [Member]
         
Stock Based Compensation [Line Items]          
Vesting period 4 years        
Time-based and vest over period of restricted stock units 2 years 3 years      
Restricted Stock Units [Member]
         
Stock Based Compensation [Line Items]          
Remaining shares are restricted stock grants 703 1,581 668    
Granted, grant date fair value 24,408 48,530 23,299    
Time Based Restricted Stock Units Vesting from 1 Year to 3 Year [Member]
         
Stock Based Compensation [Line Items]          
Granted, Shares 160 93 271    
Performance Based Restricted Stock Units One Year Vesting [Member]
         
Stock Based Compensation [Line Items]          
Granted, Shares   699 18    
Performance Based Restricted Stock Units Two Year Vesting [Member]
         
Stock Based Compensation [Line Items]          
Granted, Shares   882 611    
Performance Based Restricted Stock Units Three Year Vesting [Member]
         
Stock Based Compensation [Line Items]          
Granted, Shares     39    
HGI [Member]
         
Stock Based Compensation [Line Items]          
Granted, Options 2,275        
Exercise of stock options, Shares (8)        
Exercised, weighted average exercise price $ 3.33        
Stock option awards grant date total fair value 352        
HGI [Member] | Restricted Shares [Member]
         
Stock Based Compensation [Line Items]          
Granted, shares 838        
HGI [Member] | Restricted Stock Units [Member]
         
Stock Based Compensation [Line Items]          
Granted, shares 22        
HGI [Member] | Stock Options Granted One [Member]
         
Stock Based Compensation [Line Items]          
Granted, Options 10,000        
Stock option award grant date fair value, per share $ 2.35        
HGI [Member] | Stock Options Granted Two [Member]
         
Stock Based Compensation [Line Items]          
Granted, Options 125,000        
Stock option award grant date fair value, per share $ 2.63        
FGL [Member]
         
Stock Based Compensation [Line Items]          
Granted, Options 207        
Stock option awards grant date total fair value 807        
FGL [Member] | Minimum [Member]
         
Stock Based Compensation [Line Items]          
Vesting period 3 years        
FGL [Member] | Maximum [Member]
         
Stock Based Compensation [Line Items]          
Vesting period 7 years        
Long Term Incentive Plan [Member] | HGI [Member]
         
Stock Based Compensation [Line Items]          
Granted, Options 8,000        
Long Term Incentive Plan [Member] | HGI [Member] | Minimum [Member]
         
Stock Based Compensation [Line Items]          
Vesting period 3 years        
Long Term Incentive Plan [Member] | HGI [Member] | Maximum [Member]
         
Stock Based Compensation [Line Items]          
Vesting period 10 years        
2011 Omnibus Award Plan [Member] | HGI [Member]
         
Stock Based Compensation [Line Items]          
Maximum number of shares available for issuance under plan 17,000        
HGI's executive bonus plan [Member] | Minimum [Member]
         
Stock Based Compensation [Line Items]          
Vesting period 12 months        
HGI's executive bonus plan [Member] | Maximum [Member]
         
Stock Based Compensation [Line Items]          
Vesting period 36 months        
HGI's executive bonus plan [Member] | Deferred Bonus [Member]
         
Stock Based Compensation [Line Items]          
Vesting period 3 years        
Deferred bonus compensation expense $ 25,000        
HGI's executive bonus plan [Member] | Restricted Shares [Member]
         
Stock Based Compensation [Line Items]          
Share-based compensation arrangement by share-based payment award, number of shares authorized 3,200        
HGI's executive bonus plan [Member] | Stock Options [Member]
         
Stock Based Compensation [Line Items]          
Share-based compensation arrangement by share-based payment award, number of shares authorized 1,500