FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS (Level 3 Valuation Inputs) (Details) - Fair Value, Inputs, Level 3 [Member] $ in Thousands		Apr. 30, 2021 USD ($)	Oct. 31, 2020 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value		$ 43,457	$ 41,974
FY2020 Acquisition Subsidiary 1
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value		10,821
FY2020 Acquisition Subsidiary 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value		14,304
FY 2017 Acquisition [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value		$ 18,332
Measurement Input, Long-term Revenue Growth Rate [Member] | FY2020 Acquisition Subsidiary 1
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	[1]	0.07
Measurement Input, Long-term Revenue Growth Rate [Member] | FY2020 Acquisition Subsidiary 1 | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input		0
Measurement Input, Long-term Revenue Growth Rate [Member] | FY2020 Acquisition Subsidiary 1 | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input		0.19
Measurement Input, Long-term Revenue Growth Rate [Member] | FY2020 Acquisition Subsidiary 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	[1]	0.13
Measurement Input, Long-term Revenue Growth Rate [Member] | FY2020 Acquisition Subsidiary 2 | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input		0.04
Measurement Input, Long-term Revenue Growth Rate [Member] | FY2020 Acquisition Subsidiary 2 | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input		0.18
Measurement Input, Long-term Revenue Growth Rate [Member] | FY 2017 Acquisition [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	[1]	0.06
Measurement Input, Long-term Revenue Growth Rate [Member] | FY 2017 Acquisition [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input		(0.03)
Measurement Input, Long-term Revenue Growth Rate [Member] | FY 2017 Acquisition [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input		0.10
Measurement Input, Discount Rate [Member] | FY2020 Acquisition Subsidiary 1
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	[1]	0.046
Measurement Input, Discount Rate [Member] | FY2020 Acquisition Subsidiary 1 | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input		0.044
Measurement Input, Discount Rate [Member] | FY2020 Acquisition Subsidiary 1 | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input		0.049
Measurement Input, Discount Rate [Member] | FY2020 Acquisition Subsidiary 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	[1]	0.049
Measurement Input, Discount Rate [Member] | FY2020 Acquisition Subsidiary 2 | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input		0.049
Measurement Input, Discount Rate [Member] | FY2020 Acquisition Subsidiary 2 | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input		0.049
Measurement Input, Discount Rate [Member] | FY 2017 Acquisition [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	[1]	0.036
Measurement Input, Discount Rate [Member] | FY 2017 Acquisition [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input		0.036
Measurement Input, Discount Rate [Member] | FY 2017 Acquisition [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input		0.036

[1] Unobservable inputs were weighted by the relative fair value of the contingent consideration liability