SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Millions	9 Months Ended
	Jul. 31, 2017	Oct. 31, 2016
Significant Accounting Policies [Line Items]
Carrying value of minority equity interest	$ 6.0
Expected economic lives of finite-lived intangible assets, maximum (in years)	7 years
Expected number of years Spares usage cost is expensed (in years)	4 years
One-time employee termination benefits related service period (more than 60 days)	60 days
Minimum | Equipment, furniture and fixtures
Significant Accounting Policies [Line Items]
Estimated useful lives capitalized and amortized straight-line (in years)	2 years
Minimum | Software and website development
Significant Accounting Policies [Line Items]
Estimated useful lives capitalized and amortized straight-line (in years)	2 years
Maximum
Significant Accounting Policies [Line Items]
Measurement period for marketable debt securities (in years)	1 year
Derivative maturity (in months)	12 months
Maximum | Equipment, furniture and fixtures
Significant Accounting Policies [Line Items]
Estimated useful lives capitalized and amortized straight-line (in years)	5 years
Maximum | Software and website development
Significant Accounting Policies [Line Items]
Estimated useful lives capitalized and amortized straight-line (in years)	5 years
Other noncurrent assets | Accounting Standards Update 2015-03
Significant Accounting Policies [Line Items]
Unamortized debt issuance costs	$ (5.8)	$ (8.9)
Long-term debt | Accounting Standards Update 2015-03
Significant Accounting Policies [Line Items]
Unamortized debt issuance costs	$ 5.8	$ 8.9