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Treasury Stock - Narrative (Details) - shares | Sep. 30, 2017 | May 31, 2017 | Mar. 31, 2017 | Sep. 30, 2015 | Sep. 30, 2013
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Stockholders' Equity Note [Abstract] |  |  |  |  |
Number of shares authorized to be repurchased (up to) (in shares) | 7,000,000 | 2,000,000 | 5,000,000 | 170,000 | 105,000

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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- References No definition available. + Details
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