Derivative Instruments \| Net Investment Hedges - Impact on AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
Apr. 30, 2020	Apr. 30, 2019
Net Investment Hedges - Impact on AOCI [Abstract]
Gain (loss) recognized in other comprehensive income (loss)	$ 24,934	$ 2,496
Gain (loss) reclassified from accumulated OCI into income	0	0
Gain (loss) recognized in income, amount excluded from effectiveness testing	$ 3,316	$ 316

Net Investment Hedges - Impact on AOCI [Abstract]

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- Definition

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

+ References

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- Definition

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References

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- Definition

Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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