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Equity Incentive Plan (Restricted Stock Activity) (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Sep. 30, 2018
USD ($)
$ / shares
shares
TSR Units [Member]  
Shares  
Shares granted 184
Restricted Stock Units (RSUs) [Member]  
Shares  
Balance of outstanding restricted stock units, beginning, Shares 3,487
Shares granted 2,190
Vested, Shares (1,829)
Forfeited or not earned, Shares (564)
Balance of outstanding restricted stock units, ending, Shares 3,284
Weighted Average Grant Date Fair Value (Per Share)  
Balance of outstanding restricted stock units, beginning (in USD per share) | $ / shares $ 45.57
Weighted average fair value per share | $ / shares 76.17
Vested (in USD per share) | $ / shares 43.91
Forfeited or not earned (in USD per share) | $ / shares 51.32
Balance of outstanding restricted stock units, ending (in USD per share) | $ / shares $ 65.93
Intrinsic value [Abstract]  
Aggregate Intrinsic Value, Ending Balance of outstanding restricted stock | $ $ 348,638