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Leases - Schedule of Lease Cost Included In Operating Expenses in Condensed Consolidated Statements of Operations (Details) - USD ($) $ in Thousands		3 Months Ended
		Apr. 30, 2020	Apr. 30, 2019
Finance lease cost:
Amortization of finance lease right-of-use assets		$ 13,106	$ 8,623
Interest on finance lease liabilities		1,526	685
Operating lease cost, gross		13,117	11,791
Variable lease cost, gross		2,724	2,868
Sublease income		(2,808)	(2,764)
Total lease cost	[1]	$ 27,665	$ 21,203
[1] Short-term lease cost was not material for the periods presented and is not included in the table above.

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Lessee finance lease cost.

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Amount of interest expense on finance lease liability.

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Amount of amortization expense attributable to right-of-use asset from finance lease.

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Amount of lease cost recognized by lessee for lease contract.

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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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Amount of sublease income excluding finance and operating lease expense.

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Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.

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