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, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017
Segment Reporting [Abstract]
Total profit for reportable segments	$ 126,705	$ 103,531	$ 244,428	$ 179,449
Interest expense	(12,127)	(7,907)	(23,445)	(13,548)
Interest and investment income	219	272	509	545
Other - net	3,322	(1,323)	145	(1,480)
Income before income taxes	$ 118,119	$ 94,573	$ 221,637	$ 164,966