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Subsequent Events Subsequent Events	6 Months Ended
Subsequent Events Subsequent Events	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Borrowings In April 2018, we borrowed $150 million and subsequently repaid $50 million under our credit facility. The borrowings were made for the repurchase of shares of our common stock and to fund working capital requirements. Share Repurchases We resumed our share repurchase program and entered into a $100 million accelerated share repurchase ("ASR") agreement with a major financial institution ("Bank") on April 20, 2018. We used cash from borrowings under our credit facility to make the repurchase. On April 20, 2018, 951,814 shares were repurchased at the market price of $84.05 per share, totaling $80 million. The remaining $20 million represents the amount held back by the Bank pending final settlement of the ASR. Upon settlement of the ASR, the total shares repurchased by us will equal up to $100 million divided by a share price equal to the average daily volume weighted-average price of our common stock during the term of the ASR program less a fixed per share discount. Final settlement of the ASR will occur no later than June 26, 2018 at the Bank's discretion. All shares repurchased are automatically restored to the status of authorized and unissued.