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COMMITMENTS - Leases (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jan. 31, 2022 | Jan. 31, 2021 | Jan. 31, 2020
Operating leases, options to extend | true |  |
Operating leases, options to terminate | true |  |
Operating lease expense | $ 3,391 | $ 1,820 | $ 1,004
Operating lease payments | $ 3,300 | 2,000 |
Weighted average lease term | 46 months |  |
Weighted average discount rate | 2.50% |  |
Future minimum lease payment | $ 3,500 | 3,000 |
Unsatisfied bonded performance obligations | 235,100 |  |
April 30, 2022 | 1,457 |  |
Bonds outstanding, covering other risks | 1,000 |  |
Company's expense for defined contribution savings plans | $ 2,300 | 1,900 | 1,700
Minimum |  |  |
Deferred period | 5 years |  |
Maximum |  |  |
Deferred period | 7 years |  |
London Interbank Offered Rate (LIBOR) |  |  |
Interest rate margin on referred rate | 1.60% |  |
TRC |  |  |
April 30, 2022 | $ 300 |  |
GPS | Financial guarantee |  |  |
Guarantor obligation maximum exposure | 3,600 |  |
SMC |  |  |
April 30, 2022 | 100 |  |
Costs of Revenues [Member] |  |  |
Rent expense | 12,000 | 7,100 | 4,000
Selling, General and Administrative Expenses [Member] |  |  |
Rent expense | $ 1,000 | $ 900 | $ 700

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