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Other Assets (Summary of Future Estimated Amortization Expense Related to Acquired Land Leasehold Interest and Technology Patents) (Details) - USD ($)
$ in Thousands
Jul. 31, 2019
Jan. 31, 2019
Finite-Lived Intangible Assets [Line Items]    
Total $ 277,953 $ 313,240
Technology patents and other intangible assets, net    
Finite-Lived Intangible Assets [Line Items]    
Remainder of 2020 1,621  
2021 2,926  
2022 2,512  
2023 2,246  
2024 1,943  
Thereafter 7,454  
Total $ 18,702 $ 20,335