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Other Assets (Summary of Future Estimated Amortization Expense Related to Acquired Land Leasehold Interest and Technology Patents) (Detail) - USD ($)
$ in Thousands
Jan. 31, 2019
Jan. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Total $ 313,240 $ 34,234
Acquired Land Leasehold Interest And Technology Patents    
Finite-Lived Intangible Assets [Line Items]    
2020 3,360  
2021 3,031  
2022 2,617  
2023 2,351  
2024 2,049  
Thereafter 16,392  
Total $ 29,800