SUPPLEMENTAL BALANCE SHEET INFORMATION - Finite-Lived Intangible Assets Acquired (Details) $ in Millions	6 Months Ended
	Apr. 30, 2017 USD ($)
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	$ 310.6
Accumulated amortization	(73.4)
Net carrying value	237.2
Foreign exchange	(3.3)
Balance, end of period	233.9
Favorable agreements
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	1.0
Accumulated amortization	(1.0)
Net carrying value	$ 0.0
Weighted Average Useful Life (in Years)	0 years
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	$ 1.6
Accumulated amortization	(0.9)
Net carrying value	$ 0.7
Weighted Average Useful Life (in Years)	5 years 7 months 6 days
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	$ 54.1
Accumulated amortization	(19.4)
Net carrying value	$ 34.7
Weighted Average Useful Life (in Years)	10 years 9 months 18 days
Trade secrets and patents
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	$ 2.5
Accumulated amortization	(0.4)
Net carrying value	$ 2.1
Weighted Average Useful Life (in Years)	14 years 6 months
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	$ 248.8
Accumulated amortization	(49.5)
Net carrying value	$ 199.3
Weighted Average Useful Life (in Years)	14 years 2 months 12 days
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	$ 2.6
Accumulated amortization	(2.2)
Net carrying value	$ 0.4
Weighted Average Useful Life (in Years)	3 years