Stockholders' Equity (Details) - $ / shares	2 Months Ended	12 Months Ended
	Dec. 18, 2018	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Share Repurchase Program
Number of shares purchased		12,108,000	7,694,000	13,652,000
Average price per share		$ 41.56	$ 37.81	$ 28.77
Remaining authorization at October 31		10,989,000	8,144,000	15,838,000
Subsequent Event [Member]
Share Repurchase Program
Number of shares purchased	783,000
Average price per share	$ 32.02