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Leases - Information Related to Our Right-of-Use Assets and Lease Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020	Jan. 31, 2021
Leases [Abstract]
Cash paid for operating lease liabilities	$ 19,951	$ 21,153	$ 46,573	$ 42,165
Operating lease right-of-use assets obtained in exchange for new operating lease liabilities	$ 17,188	$ 32,216	$ 38,689	$ 70,503
Weighted average remaining lease term (in years)	5 years		5 years		6 years
Weighted average discount rate	2.36%		2.36%		1.73%

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
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Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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-Publisher FASB
-Name Accounting Standards Codification
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