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Derivative Instruments - Effect of Cash Flow Hedges on Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Total revenues	$ 825,055	$ 618,643
Revenues
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gains (losses) related to foreign currency forward contracts designated as cash flow hedges	$ 16

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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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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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