ACQUISITIONS (Total Consideration) (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2019
Business Acquisition [Line Items]
Cash paid, net	$ 136,500	$ 163,939	$ 240,841
FY2021 Acquisitions [Member]
Business Acquisition [Line Items]
Cash paid	136,995
Less: cash acquired	(639)
Cash paid, net	136,356
Contingent purchase consideration	18,334
Additional purchase consideration	56
Total purchase consideration	$ 154,746
FY2020 Acquisitions [Member]
Business Acquisition [Line Items]
Cash paid		165,290
Less: cash acquired		(1,323)
Cash paid, net		163,967
Contingent purchase consideration		23,719
Additional purchase consideration		144
Total purchase consideration		$ 187,830
FY2019 Acquisitions [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