Derivative Financial (Derivative financial instruments designated as cash flow hedges) (Details) - USD ($)	Oct. 31, 2017	Oct. 31, 2013
Senior Notes 2027 [Member]
Derivative Cash Flow Hedge [Line Items]
Prinicipal amount of debt issued	$ 300,000,000.0
Interest rate on unsecured senior note debt	3.50%
Senior Notes 2023 [Member]
Derivative Cash Flow Hedge [Line Items]
Prinicipal amount of debt issued		$ 325,000,000.0
Interest rate on unsecured senior note debt		3.625%