Employee Benefit Plans - Details of Weighted Average Assumptions Used in the Accounting for the Pension Plan (Detail) |
Jan. 31, 2017 |
Jan. 31, 2016 |
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| Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] | ||
| Discount rate | 5.72% | 5.08% |
| Compensation increase rate | 5.00% | 7.00% |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition The interest rate used to adjust for the time value of money for the plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Expected rate of compensation increases (for pay-related plans). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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