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Subsequent Events	9 Months Ended
Subsequent Events	Jun. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events In July 2018, our Board of Directors approved a new stock repurchase program following the completion of a similar program that was approved in October 2017. The new program is open-ended and authorizes repurchases of shares of our common stock up to an aggregate cost of $250.0 million in the open market or in negotiated transactions.