ACQUISITIONS (Total Consideration) (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Business Acquisition [Line Items]
Cash paid, net	$ 163,939	$ 240,841	$ 59,775
FY2020 Acquisition [Member]
Business Acquisition [Line Items]
Cash paid	165,290
Less: cash acquired	(1,351)
Cash paid, net	163,939
Contingent purchase consideration	23,719
Additional purchase consideration	283
Total purchase consideration	$ 187,941
FY2019 Acquisition [Member]
Business Acquisition [Line Items]
Cash paid		243,550
Less: cash acquired		(2,466)
Cash paid, net		241,084
Contingent purchase consideration		2,107
Fair value of existing equity interest		1,417
Total purchase consideration		$ 244,608
FY2018 Acquisition [Member]
Business Acquisition [Line Items]
Cash paid			61,931
Less: cash acquired			(4,000)
Cash paid, net			57,931
Additional purchase consideration			(243)
Total purchase consideration			$ 57,688