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Equity Incentive Plan (Restricted Stock Activity) (Details) - Restricted Stock Units (RSUs)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
shares
Shares  
Balance of outstanding restricted stock units, beginning, Shares | shares 4,379
Shares granted | shares 1,910
Vested, Shares | shares (2,206)
Forfeited or not earned, Shares | shares (429)
Balance of outstanding restricted stock units, ending, Shares | shares 3,654
Weighted Average Grant Date Fair Value (Per Share)  
Balance of outstanding restricted stock units, beginning (in USD per share) $ 26.87
Weighted average fair value per share 38.19
Vested (in USD per share) 24.67
Forfeited or not earned (in USD per share) 30.94
Balance of outstanding restricted stock units, ending (in USD per share) $ 33.64
Intrinsic value [Abstract]  
Aggregate Intrinsic Value, Ending Balance of outstanding restricted stock | $ $ 115,987