Operating Segments - Reconciliation of Segment Operating Income to Consolidated Income Before Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Segment Reporting [Abstract]
Total profit for reportable segments	$ 103,531	$ 101,904	$ 179,449	$ 153,882
Interest expense	(7,907)	(5,000)	(13,548)	(10,844)
Interest and investment income	272	188	545	326
Other - net	(1,323)	1,727	(1,480)	2,529
Income before income taxes	$ 94,573	$ 98,819	$ 164,966	$ 145,893