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Share Repurchase	6 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Share Repurchase	Share Repurchase On June 21, 2016, the Company's Board of Directors authorized the repurchase of up to $500.0 million of the Company's outstanding common stock over the next 5 years. During the three and six months ended March 31, 2018, the Company repurchased 2.8 million shares of its common stock for total consideration of $106.5 million, of which $15.8 million was paid subsequent to March 31, 2018. As a result, $193.6 million remained available to be repurchased under this authorization as of March 31, 2018.

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- References

No definition available.

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- Definition

The entire disclosure for treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-URI http://asc.fasb.org/subtopic&trid=2208821

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