STOCKHOLDERS' EQUITY STOCKHOLDERS' EQUITY - AMOUNTS RECLASSIFIED OUT OF ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($) $ in Thousands	3 Months Ended
Apr. 30, 2020	Apr. 30, 2019
Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
Amounts reclassified out of accumulated other comprehensive income (loss)	$ (509)
Foreign Exchange Contract
Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
Derivative Instruments, gains (losses) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(52)	$ (939)
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Income Taxes	6	94
Amounts reclassified out of accumulated other comprehensive income (loss)	(46)	(845)
Foreign Exchange Contract \| Cost of revenue - product
Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
Derivative Instruments, gains (losses) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(3)	(72)
Foreign Exchange Contract \| Cost of revenue - service and support
Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
Derivative Instruments, gains (losses) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(5)	(84)
Foreign Exchange Contract \| Research and development, net
Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
Derivative Instruments, gains (losses) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(27)	(472)
Foreign Exchange Contract \| Selling, General and Administrative Expenses
Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
Derivative Instruments, gains (losses) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(17)	(311)
Interest rate swap
Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
Derivative Instruments, gains (losses) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(591)	0
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Income Taxes	128	0
Amounts reclassified out of accumulated other comprehensive income (loss)	(463)	0
Interest rate swap \| Interest Expense
Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
Derivative Instruments, gains (losses) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ (591)	$ 0

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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- Definition

Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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