Employee Benefit Plans - Additional Information (Detail) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Jan. 31, 2018 |
Jan. 31, 2017 |
Jan. 31, 2016 |
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| Pension Plans, Postretirement and Other Employee Benefits [Line Items] | |||
| Pension benefit obligation balance | $ 0 | $ 530,000 | $ 1,063,000 |
| Retirement Savings Plan [Member] | |||
| Pension Plans, Postretirement and Other Employee Benefits [Line Items] | |||
| Defined contribution plan, cost recognized | $ 1,100,000 | $ 1,400,000 | $ 1,500,000 |
| X | ||||||||||
- Definition Pension Plans, Postretirement and Other Employee Benefits [Line Items] No definition available.
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| X | ||||||||||
- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. No definition available.
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| X | ||||||||||
- Details
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