Derivative Instruments - Offsetting Arrangements (Details) - USD ($) $ in Thousands	Apr. 30, 2020	Jan. 31, 2020
Derivative assets:
Net Amounts of Assets in the Condensed Consolidated Balance Sheets	$ 1,648	$ 683
Derivative liabilities:
Net Amounts of Assets in the Condensed Consolidated Balance Sheets	1,353	342
Foreign currency forward
Derivative assets:
Gross Amounts of Recognized Assets	1,648	683
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0	0
Net Amounts of Assets in the Condensed Consolidated Balance Sheets	1,648	683
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments	(987)	(342)
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received	0	0
Net Asset Exposed	661	341
Derivative liabilities:
Gross Amounts of Recognized Liabilities	1,353	342
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0	0
Net Amounts of Assets in the Condensed Consolidated Balance Sheets	1,353	342
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments	(987)	(342)
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received	0	0
Net Liabilities Exposed	366	0
Foreign currency forward | Counterparty A
Derivative assets:
Gross Amounts of Recognized Assets	661	102
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0	0
Net Amounts of Assets in the Condensed Consolidated Balance Sheets	661	102
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments	0	(5)
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received	0	0
Net Asset Exposed	661	97
Derivative liabilities:
Gross Amounts of Recognized Liabilities	0	5
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0	0
Net Amounts of Assets in the Condensed Consolidated Balance Sheets	0	5
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments	0	(5)
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received	0	0
Net Liabilities Exposed	0	0
Foreign currency forward | Counterparty B
Derivative assets:
Gross Amounts of Recognized Assets	987	581
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0	0
Net Amounts of Assets in the Condensed Consolidated Balance Sheets	987	581
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments	(987)	(337)
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received	0	0
Net Asset Exposed	0	244
Derivative liabilities:
Gross Amounts of Recognized Liabilities	1,353	337
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0	0
Net Amounts of Assets in the Condensed Consolidated Balance Sheets	1,353	337
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments	(987)	(337)
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received	0	0
Net Liabilities Exposed	$ 366	$ 0