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DERIVATIVE FINANCIAL INSTRUMENTS - CASH FLOW HEDGES (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Jan. 31, 2020
DERIVATIVE FINANCIAL INSTRUMENTS
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (178,774)		$ (151,865)
Cash flow hedging \| Derivative designated as hedging instruments
DERIVATIVE FINANCIAL INSTRUMENTS
Net (losses) gains recognized in other comprehensive income (loss)	(8,460)	$ (1,675)
Derivative Instruments, gains (losses) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(643)	(939)
2018 Interest Rate Swap \| Cash flow hedging \| Derivative designated as hedging instruments
DERIVATIVE FINANCIAL INSTRUMENTS
Net losses on interest rate swaps expected to be reclassified to earnings during next 12 months	(3,100)
Foreign Exchange Contract
DERIVATIVE FINANCIAL INSTRUMENTS
Derivative Instruments, gains (losses) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(52)	(939)
Foreign Exchange Contract \| Cash flow hedging \| Derivative designated as hedging instruments
DERIVATIVE FINANCIAL INSTRUMENTS
Net (losses) gains recognized in other comprehensive income (loss)	(925)	342
Derivative Instruments, gains (losses) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(52)	(939)
Interest rate swap
DERIVATIVE FINANCIAL INSTRUMENTS
Net (losses) gains recognized in other comprehensive income (loss)	(6,944)	(2,017)
Derivative Instruments, gains (losses) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(591)	0
Interest rate swap \| Cash flow hedging \| Derivative designated as hedging instruments
DERIVATIVE FINANCIAL INSTRUMENTS
Net (losses) gains recognized in other comprehensive income (loss)	(7,535)	(2,017)
Derivative Instruments, gains (losses) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(591)	$ 0
Unrealized gains (losses) on derivative financial instruments designated as hedges \| 2018 Interest Rate Swap \| Cash flow hedging \| Derivative designated as hedging instruments
DERIVATIVE FINANCIAL INSTRUMENTS
Accumulated Other Comprehensive Income (Loss), Net of Tax	(16,000)
Unrealized gains (losses) on derivative financial instruments designated as hedges \| Foreign Exchange Contract
DERIVATIVE FINANCIAL INSTRUMENTS
Accumulated Other Comprehensive Income (Loss), Net of Tax	(157)		626
Unrealized gains (losses) on derivative financial instruments designated as hedges \| Foreign Exchange Contract \| Cash flow hedging \| Derivative designated as hedging instruments
DERIVATIVE FINANCIAL INSTRUMENTS
Net gains on foreign currency forward contracts expected to be reclassified to earnings during next 12 months	(200)
Unrealized gains (losses) on derivative financial instruments designated as hedges \| Interest rate swap
DERIVATIVE FINANCIAL INSTRUMENTS
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (16,014)		$ (10,528)