FINANCIAL INSTRUMENTS, FAIR VALUE AND RISK MANAGEMENT - Summary of Financial Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Millions	Apr. 30, 2017	Oct. 31, 2016	Jan. 31, 2016	Jan. 29, 2016
Assets measured at fair value
Available-for-sale securities	$ 1.4	$ 1.4
Held-for-trading securities	1.5	1.4
Total assets	2.9	2.8
Liabilities measured at fair value
Earnout liability	37.9	33.8	$ 31.1	$ 36.0
Total liabilities	39.7	36.5
Foreign exchange forward contracts
Liabilities measured at fair value
Foreign exchange forward contracts	1.8	2.7
Level 1
Assets measured at fair value
Available-for-sale securities	1.4	1.4
Held-for-trading securities	0.0	0.0
Total assets	1.4	1.4
Liabilities measured at fair value
Earnout liability	0.0	0.0
Total liabilities	0.0	0.0
Level 1 | Foreign exchange forward contracts
Liabilities measured at fair value
Foreign exchange forward contracts	0.0	0.0
Level 2
Assets measured at fair value
Available-for-sale securities	0.0	0.0
Held-for-trading securities	1.5	1.4
Total assets	1.5	1.4
Liabilities measured at fair value
Earnout liability	0.0	0.0
Total liabilities	1.8	2.7
Level 2 | Foreign exchange forward contracts
Liabilities measured at fair value
Foreign exchange forward contracts	1.8	2.7
Level 3
Assets measured at fair value
Available-for-sale securities	0.0	0.0
Held-for-trading securities	0.0	0.0
Total assets	0.0	0.0
Liabilities measured at fair value
Earnout liability	37.9	33.8
Total liabilities	37.9	33.8
Level 3 | Foreign exchange forward contracts
Liabilities measured at fair value
Foreign exchange forward contracts	$ 0.0	$ 0.0