Income Taxes (Schedule of Income Before Income Tax, Domestic Foreign) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2014
Income (loss) before income taxes:
United States									$ 31,500	$ 31,900	$ 32,500
Foreign									264,100	183,600	264,000
Income before income taxes	$ 68,900	$ 93,400	$ 82,600	$ 50,700	$ 36,400	$ 44,600	$ 67,000	$ 67,500	295,633	215,485	296,534
Income tax provision									$ 20,699	$ 10,341	$ 24,705