STOCK-BASED COMPENSATION - Summary of Activity under Company's Stock Option Plans (Details) - $ / shares shares in Thousands		9 Months Ended		12 Months Ended
	Jan. 31, 2017	Oct. 31, 2017	Oct. 31, 2016	Jan. 31, 2016
STOCK-BASED COMPENSATION
Shares, Outstanding, Beginning balance		707	1,064
Shares, Granted		125	105
Shares, Exercised		(90)	(444)
Shares, Forfeited		(10)	(5)
Shares, Outstanding, Ending balance	707	732	720	1,064
Shares, Exercisable		452	555
Weighted Average Exercise Price, Outstanding, Beginning balance		$ 39.04	$ 26.38
Weighted Average Exercise Price, Granted		63.58	36.09
Weighted Average Exercise Price, Exercised		30.74	24.77
Weighted Average Exercise Price, Forfeited		71.75	36.73
Weighted Average Exercise Price, Outstanding, Ending balance	$ 39.04	43.81	28.71	$ 26.38
Weighted Average Exercise Price, Exercisable		$ 28.75	$ 27.13
Weighted Average Remaining Term, Outstanding	7 years 9 months 26 days	7 years 7 months 2 days	7 years 2 months 16 days	6 years 4 months 10 days
Weighted Average Remaining Term, Exercisable		6 years 6 months 7 days	6 years 6 months 18 days
Weighted Average Fair Value, Outstanding	$ 10.22	$ 11.61	$ 7.62	$ 6.91
Weighted Average Fair Value, Exercisable		$ 7.76	$ 7.16