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Stock-based Compensation (Narrative) (Details)
3 Months Ended
Dec. 31, 2016
USD ($)
shares / unit
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Common Stock Issuable per Restricted Stock Unit | shares / unit 1
ESPP maximum contribution percentage 10.00%
ESPP maximum contribution amount by employee | $ $ 25,000
ESPP purchase price as a % of stock price 85.00%
Restricted Stock Units (RSUs)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted, shares 1,391,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares $ 50.58
TSR Units [Member] | Restricted Stock Units (RSUs)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation Arrangement by Share-based Payment Award, Target Multiplier 2
Granted, shares 356,000 [1]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares $ 68.02
TSR Units [Member] | Restricted Stock Units (RSUs) | Maximum [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted, shares 495,000 [1]
[1] The TSR units were granted to our executive officers pursuant to the terms described below.