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Earnings Per Share - Diluted Shares Calculation (Details) - shares shares in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2016
Earnings Per Share [Abstract] |  |  |  |
Basic and diluted (shares) | 31,969 | 31,808 | 31,931 | 31,783

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS). + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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