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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, 2017
USD ($)
$ / shares
shares
Shares  
Balance of outstanding restricted stock units, beginning, Shares | shares 3,776
Shares granted | shares 1,946
Vested, Shares | shares (1,586)
Forfeited or not earned, Shares | shares (649)
Balance of outstanding restricted stock units, ending, Shares | shares 3,487
Weighted Average Grant Date Fair Value (Per Share)  
Balance of outstanding restricted stock units, beginning (in USD per share) | $ / shares $ 37.30
Weighted average fair value per share | $ / shares 51.27
Vested (in USD per share) | $ / shares 36.05
Forfeited or not earned (in USD per share) | $ / shares 37.83
Balance of outstanding restricted stock units, ending (in USD per share) | $ / shares $ 45.57
Intrinsic value [Abstract]  
Aggregate Intrinsic Value, Ending Balance of outstanding restricted stock | $ $ 196,230