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Equity Incentive Plan (Restricted Stock Activity) (Details) - Restricted Stock Units (RSUs) [Member]
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Sep. 30, 2016
USD ($)
$ / shares
shares
Shares  
Balance of outstanding restricted stock units, beginning, Shares | shares 3,654
Shares granted | shares 2,484
Vested, Shares | shares (1,818)
Forfeited or not earned, Shares | shares (544)
Balance of outstanding restricted stock units, ending, Shares | shares 3,776
Weighted Average Grant Date Fair Value (Per Share)  
Balance of outstanding restricted stock units, beginning (in USD per share) | $ / shares $ 33.64
Weighted average fair value per share | $ / shares 37.25
Vested (in USD per share) | $ / shares 30.10
Forfeited or not earned (in USD per share) | $ / shares 36.49
Balance of outstanding restricted stock units, ending (in USD per share) | $ / shares $ 37.30
Intrinsic value [Abstract]  
Aggregate Intrinsic Value, Ending Balance of outstanding restricted stock | $ $ 167,314