REVENUES - Contract with Customer, Asset and Liability (Details) - USD ($)	3 Months Ended
	Jan. 31, 2022	Oct. 31, 2021
Revenue from Contract with Customer [Abstract]
Billed trade receivables	$ 1,102,700,000	$ 1,057,600,000
Unbilled trade receivables	141,300,000	112,100,000
Costs incurred in excess of amounts billed	69,100,000	52,500,000
Capitalized commissions	27,900,000	$ 27,800,000
Capitalized contract price	3,500,000
Capitalized contract cost, amortization	(3,500,000)
Capitalized contract cost, impairment loss	0
Contract with Customer, Liabilities [Roll Forward]
Contract liabilities, balance at beginning of period	58,500,000
Additional contract liabilities	72,700,000
Recognition of deferred revenue	(63,200,000)
Contract liabilities, balance at end of period	$ 68,000,000.0