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Share-Based Compensation - Stock Option Activity (Details) (USD $)
3 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share Price $ 28.95   $ 21.61
Non-qualified Stock Options with Time-based Vesting (NQO) [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares   0  
2007 Amended and Restated Long-term Incentive Plan | Non-qualified Stock Options with Time-based Vesting (NQO) [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options 361,700   412,454
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (39,616)    
Number of Stock Options, Cancelled/Forfeited (11,138)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Weighted Average Exercise Price, Beginning balance $ 12.44    
Weighted Average Exercise Price, Granted $ 0.00    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price $ 14.67    
Weighted Average Exercise Price, Cancelled/Forfeited $ 10.18    
Weighted Average Exercise Price, Ending balance $ 12.27   $ 12.44
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Weighted Average Grant Date Fair Value, Beginning balance $ 5.30    
Weighted average fair value of PNQs $ 0.00    
ShareBased Compensation Arrangement By ShareBased Payment Award,Options, Exercises In Period, Weighted Average Grant Date Fair Value $ 5.70    
Weighted Average Grant Date Fair Value, Cancelled/Forfeited $ 4.85    
Weighted Average Grant Date Fair Value, Ending balance $ 4.14   $ 5.30
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Intrinsic Value [Roll Forward]      
Aggregate Intrinsic Value, Beginning balance $ 6,034,000   $ 3,782,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value 351,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Cancellations/Forfeitures in Period, Total Intrinsic Value 0    
Aggregate Intrinsic Value, Ending balance 6,034,000   3,782,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Weighted Average Remaining Life, Beginning balance 4 years 3 months 18 days   4 years 4 months 24 days
Weighted Average Remaining Life, Ending balance 4 years 3 months 18 days   4 years 4 months 24 days
Options, Vested and exercisable, Outstanding 205,040    
Options, Vested and exercisable, Weighted Average Exercise Price $ 13.48    
Options, Vested and exercisable, Weighted Average Grant Date Fair Value $ 3.42    
Options, Vested and exercisable, Weighted Average Remaining Contractual Term 3 years 8 months 12 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value 3,173,000    
Options, Vested and expected to vest, Outstanding 356,567    
Options, Vested and expected to vest, Weighted Average Exercise Price $ 12.28    
Options, Vested and expected to vest, Weighted Average Grant Date Fair Value $ 4.12    
Options, Vested and expected to vest, Exercisable, Weighted Average Remaining Life 4 years 2 months 12 days    
Options, Vested and expected to vest, Aggregate Intrinsic Value 5,943,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value $ 0    
Allocated Share-based Compensation Expense 100,000 200,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options 500,000 1,200,000  
2007 Amended and Restated Long-term Incentive Plan | Non-qualified Stock Options with Performance-based and Time-based Vesting (PNQ) [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]      
Number of Stock Options, Beginning balance 112,442    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 0    
Number of Stock Options, Cancelled/Forfeited (7,519)    
Number of Stock Options, Ending balance 104,923    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Weighted Average Exercise Price, Beginning balance $ 21.27    
Weighted Average Exercise Price, Granted $ 0.00    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price $ 0.00    
Weighted Average Exercise Price, Cancelled/Forfeited $ 21.33    
Weighted Average Exercise Price, Ending balance $ 21.27    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Weighted Average Grant Date Fair Value, Beginning balance $ 10.49    
Weighted average fair value of PNQs $ 0.00    
ShareBased Compensation Arrangement By ShareBased Payment Award,Options, Exercises In Period, Weighted Average Grant Date Fair Value $ 0.00    
Weighted Average Grant Date Fair Value, Cancelled/Forfeited $ 10.52    
Weighted Average Grant Date Fair Value, Ending balance $ 10.49    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Intrinsic Value [Roll Forward]      
Aggregate Intrinsic Value, Beginning balance 806,000   38,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value 0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Cancellations/Forfeitures in Period, Total Intrinsic Value 0    
Aggregate Intrinsic Value, Ending balance 806,000   38,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Weighted Average Remaining Life, Beginning balance 6 years 2 months 12 days    
Weighted Average Remaining Life, Ending balance 6 years 2 months 12 days    
Options, Vested and exercisable, Outstanding 0    
Options, Vested and exercisable, Weighted Average Exercise Price $ 0.00    
Options, Vested and exercisable, Weighted Average Grant Date Fair Value $ 0.00    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value 0    
Options, Vested and expected to vest, Outstanding 97,251    
Options, Vested and expected to vest, Weighted Average Exercise Price $ 21.27    
Options, Vested and expected to vest, Weighted Average Grant Date Fair Value $ 10.49    
Options, Vested and expected to vest, Exercisable, Weighted Average Remaining Life 6 years 2 months 12 days    
Options, Vested and expected to vest, Aggregate Intrinsic Value 746,000    
Allocated Share-based Compensation Expense 100,000 0  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options $ 700,000 $ 0