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STOCKHOLDERS' EQUITY (Tables)
 12 Months Ended
Jan. 31, 2018
Stockholders' Equity Note [Abstract]  
Summary of components of accumulated other comprehensive (income) loss
The following table summarizes changes in the components of our accumulated other comprehensive income (loss) by component for the years ended January 31, 2018 and 2017:
(in thousands)
 
Unrealized Gains (Losses) on Derivative Financial Instruments Designated as Hedges
 
Unrealized Gain on Interest Rate Swap Designated as Hedge
 
Unrealized Gains (Losses) on Available-for-Sale Investments
 
Foreign Currency Translation Adjustments
 
Total
Accumulated other comprehensive loss at January 31, 2016
 
$
(1,871
)
 
$
—

 
$
(110
)
 
$
(114,213
)
 
$
(116,194
)
Other comprehensive loss before reclassifications
 
3,585

 
632

 
110

 
(41,850
)
 
(37,523
)
Amounts reclassified out of accumulated other comprehensive income (loss)
 
1,139

 
—

 
—

 
—

 
1,139

Net other comprehensive income (loss)
 
2,446

 
632

 
110

 
(41,850
)
 
(38,662
)
Accumulated other comprehensive loss at January 31, 2017
 
575

 
632

 
—

 
(156,063
)
 
(154,856
)
Other comprehensive income (loss) before reclassifications
 
8,867

 
(341
)
 
—

 
49,291

 
57,817

Amounts reclassified out of accumulated other comprehensive income (loss)
 
6,130

 
291

 
—

 
—

 
6,421

Net other comprehensive income (loss)
 
2,737

 
(632
)
 
—

 
49,291

 
51,396

Accumulated other comprehensive income (loss) at January 31, 2018
 
$
3,312

 
$
—

 
$
—

 
$
(106,772
)
 
$
(103,460
)
Schedule of amounts reclassified out of AOCI into the statement of operations by presentation location
The amounts reclassified out of accumulated other comprehensive income (loss) into the consolidated statement of operations, with presentation location, for the years ended January 31, 2018, 2017, and 2016 were as follows:
 
 
Year Ended January 31,
 
Financial Statement Location
(in thousands)
 
2018
 
2017
 
2016
 
Unrealized gains (losses) on derivative financial instruments:
 
 
 
 
 
 
 
 
Foreign currency forward contracts
 
$
621

 
$
108

 
$
(718
)
 
Cost of product revenue
 
 
599

 
115

 
(672
)
 
Cost of service and support revenue
 
 
3,577

 
651

 
(4,556
)
 
Research and development, net
 
 
2,016

 
383

 
(2,205
)
 
Selling, general and administrative
 
 
6,813

 
1,257

 
(8,151
)
 
Total, before income taxes
 
 
(683
)
 
(118
)
 
1,038

 
(Provision) benefit for income taxes
 
 
$
6,130

 
$
1,139

 
$
(7,113
)
 
Total, net of income taxes
 
 
 
 
 
 
 
 
 
Interest rate swap agreement
 
$
(254
)
 
$
—

 
$
—

 
Interest expense
 
 
934

 
—

 
—

 
Other income (expense), net
 
 
680

 
—

 
—

 
Total, before income taxes
 
 
(389
)
 
—

 
—

 
Provision for income taxes
 
 
$
291

 
$
—

 
$
—

 
Total, net of income taxes