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COMMITMENTS - Leases (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2021 | Oct. 31, 2020 | Oct. 31, 2021 | Oct. 31, 2020
Operating leases, options to extend |  |  | true |
Operating leases, options to terminate |  |  | true |
Operating lease expense | $ 1,100 | $ 500 | $ 3,017 | $ 1,318
Operating lease payments | $ 1,100 | 300 | $ 3,000 | 1,200
Weighted average lease term | 41 months |  | 41 months |
Weighted average discount rate | 2.50% |  | 2.50% |
Future minimum lease payment |  |  | $ 2,400 | 2,300
Unsatisfied bonded performance obligations | $ 272,400 |  | 272,400 |
April 30, 2022 | 1,020 |  | 1,020 |
Bonds outstanding, covering other risks |  |  | $ 800 |
London Interbank Offered Rate (LIBOR) |  |  |  |
Interest rate margin on referred rate |  |  | 1.60% |
TRC |  |  |  |
April 30, 2022 | 300 |  | $ 300 |
GPS | Financial guarantee |  |  |  |
Guarantor obligation maximum exposure | 3,600 |  | 3,600 |
Costs of Revenues |  |  |  |
Rent expense | 2,800 | 2,300 | 9,000 | 4,200
Selling, General and Administrative Expenses |  |  |  |
Rent expense | $ 300 | $ 200 | $ 700 | $ 700

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