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Basis of Presentation - Textuals (Details) - USD ($) $ in Thousands	9 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
Schedule of Equity Method Investments [Line Items]
Deferred lease payments	$ 274,836
Proceeds from borrowings - revolving facility	878,083	$ 1,816,328
Repayment of borrowings - revolving facility	878,083	1,536,448
Cash and cash equivalents	149,745	$ 55,801	$ 197,372	$ 70,138
Minimum
Schedule of Equity Method Investments [Line Items]
Availability under revolving credit facility	600,000
Accounts Payable [Member]
Schedule of Equity Method Investments [Line Items]
Deferred lease payments	$ 11,000

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Amount of lessee's undiscounted obligation for lease payment for operating lease.

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