Debt (Details) - USD ($) $ in Thousands |
6 Months Ended | ||
|---|---|---|---|
Jul. 31, 2018 |
Jan. 31, 2018 |
Jan. 31, 2017 |
|
| Debt Instrument | |||
| Other Long-term Debt | $ 20,096 | $ 26,761 | |
| Debt and Capital Lease Obligations | 1,519,182 | 1,637,909 | |
| Less-current maturities (included as Revolving credit loans and current portion of long-term debt, net) | (116,881) | (132,661) | |
| Long-term Debt and Capital Lease Obligations | 1,402,301 | 1,505,248 | |
| Repayments of Debt | 100,000 | ||
| Senior Notes | |||
| Debt Instrument | |||
| Unamortized debt discount and debt issuance costs | (7,922) | (8,678) | |
| Senior Notes, net | 992,078 | 991,322 | |
| Senior Notes | 3.70% Senior Notes | |||
| Debt Instrument | |||
| Debt Instrument, Face Amount | 500,000 | 500,000 | $ 500,000 |
| Senior Notes | 4.95% Senior Notes | |||
| Debt Instrument | |||
| Debt Instrument, Face Amount | 500,000 | 500,000 | $ 500,000 |
| Term Loan | |||
| Debt Instrument | |||
| Loans Payable | 400,000 | 500,000 | |
| Other Committed And Uncommitted Revolving Credit Facilities | |||
| Debt Instrument | |||
| Revolving Credit Loan | $ 107,008 | $ 119,826 |