EARNINGS PER SHARE (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Earnings Per Share [Abstract]
Net income	$ 66,943	$ 47,602	$ 90,116	$ 58,283
Distributed and undistributed (earnings) to unvested restricted stock	(1,015)	(735)	(1,399)	(919)
Distributed and undistributed earnings to common shareholders—Basic	$ 65,928	$ 46,867	$ 88,717	$ 57,364
Weighted average shares outstanding—Basic (in shares)	22,396	22,226	22,387	22,216
Weighted average shares outstanding—Diluted (in shares)	22,396	22,226	22,387	22,216
Earnings per common share-Basic (in usd per share)	$ 2.94	$ 2.11	$ 3.96	$ 2.58
Earnings per common share-Diluted (in usd per share)	$ 2.94	$ 2.11	$ 3.96	$ 2.58