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Leases - Schedule of aggregate future minimum payments under noncancelable operating leases (Details)
$ in Thousands
Jan. 31, 2019
USD ($)
Leases [Abstract]  
2020 $ 31,297
2021 28,573
2022 24,381
2023 20,440
2024 14,780
Thereafter 30,096
Total $ 149,567