Stock Repurchase (Notes)
6 Months Ended
Apr. 30, 2016
Equity [Abstract]  
Stockholders' Equity Note Disclosure [Text Block]
Stock Repurchase Program
In September 2015, our Board of Directors authorized a program to repurchase shares of our common stock with an aggregate value of up to $200.0 million, with no expiration from the date of authorization. Shares may be repurchased from time to time in the open market, private purchases, through forward, derivative, accelerated repurchase or automatic repurchase transactions or otherwise. Certain of our share repurchases have been and may from time to time be effected through Exchange Act Rule 10b5-1 repurchase plans. The timing and actual amount of the share repurchases will depend on several factors including price, capital availability, regulatory requirements, alternative investment opportunities, including mergers and acquisitions, market conditions and other factors. We are not obligated to repurchase any specific number of shares under the program and the repurchase program may be modified, suspended or discontinued at any time.
During the six months ended April 30, 2016, we repurchased approximately 2.6 million shares of our common stock on the open market at an average repurchase price of $28.02 per share. There were no stock repurchase activities during the three months ended April 30, 2016. As of April 30, 2016, there was approximately $50.0 million remaining available for stock repurchases under this program.