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Derivative Instruments - Gains (Losses) Associated with Foreign Currency Forward Contracts (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in OCI	$ 21,542	$ 8,612	$ 33,320	$ (7,153)
Revenues
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from AOCI into income (effective portion)	(3,847)	5,568	(4,996)	15,332
Other income (expense), net
Derivative Instruments, Gain (Loss) [Line Items]
Foreign currency forward contracts not designated as hedges	$ 605	$ 151	$ 2,424	$ 1,524

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Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments.

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Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

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Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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