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Stock-Based Compensation Narrative (Detail) (USD $)
3 Months Ended 9 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total compensation expense on awards     $ 8,774,000 $ 5,625,000
Closing stock price $ 10.77   $ 10.77  
Total intrinsic value of options exercised       19,000
Proceeds from stock options exercised       67,000
Stock purchase under employee stock purchase plan     115,132 115,751
Proceeds from issuance of shares under ESPP     1,000,000 1,000,000
Restricted Stock
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stocks granted     1,517,057  
Fair value of restricted stock awards vested 200,000 500,000 5,100,000 6,500,000
Unrecognized compensation cost 14,600,000   14,600,000  
Unrecognized compensation cost, estimated weighted average amortization period     1 year 6 months  
Restricted Stock | Senior Management
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stocks granted     1,517,057 1,284,000
Restricted Stock | Senior Management | Maximum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total compensation expense on awards     $ 19,300,000 $ 7,000,000
Restricted Stock | Senior Management | Awards Subject to Service Criteria
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stocks granted     678,307 606,625
Restricted Stock | Senior Management | Awards Subject to Performance Criteria
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stocks granted     838,750 677,375
Grants earned in period       460,615
Granville-Phillips [Member] | Restricted Stock
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stocks granted     8,500 29,380