SUPPLEMENTAL BALANCE SHEET INFORMATION - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2016	Jan. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Net carrying value		$ 1.5
Gross carrying value		2.4
In-process research and development
Finite-Lived Intangible Assets [Line Items]
Net carrying value		1.3
Gross carrying value		$ 2.2
In-process research and development | BLS | Spinoff
Finite-Lived Intangible Assets [Line Items]
Net carrying value	$ 3.6
Gross carrying value	7.9
Impairment losses	$ 4.3