Summary of Significant Accounting Policies - Stock Compensation (Details) $ in Millions	3 Months Ended
Dec. 31, 2016 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Excess tax benefit on vested awards	$ 0.5

Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount

No definition available.

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