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Leases - Schedule of Supplemental Cash Flow Information Related to Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Oct. 31, 2019
Oct. 31, 2018
 [2]
Oct. 31, 2019
Oct. 31, 2018
 [2]
Cash paid for amounts included in the measurement of lease liabilities        
Operating cash flows for operating leases $ 11,562   $ 35,053  
Operating cash flows for finance leases 802   2,531  
Financing cash flows for finance leases 7,055 [1] $ 4,290 26,200 [1] $ 17,192
Right-of-use assets obtained in exchange of lease obligations        
Operating leases [3] 1,016   230,371  
Finance leases $ 40,530 [1],[3] $ 9,230 $ 84,950 [1],[3] $ 27,751
[1] As reported and disclosed under ASC Topic 842
[2] As reported and disclosed under ASC Topic 840
[3] Includes the adoption impact of ASC Topic 842 on the opening balance sheet as of February 1, 2019 as disclosed in Note 1.