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COMMITMENTS - Leases (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2021 | Jul. 31, 2020 | Jul. 31, 2021 | Jul. 31, 2020
Operating leases, options to extend |  |  | true |
Operating leases, options to terminate |  |  | true |
Operating lease expense | $ 1,100 | $ 400 | $ 1,938 | $ 793
Operating lease payments | $ 1,100 | 400 | $ 1,900 | 800
Weighted average lease term | 27 months |  | 27 months |
Weighted average discount rate | 2.90% |  | 2.90% |
Future minimum lease payment |  |  | $ 800 | 1,500
Unsatisfied bonded performance obligations | $ 295,900 |  | 295,900 |
April 30, 2022 | 743 |  | 743 |
Bonds outstanding, covering other risks |  |  | $ 5,700 |
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 | 3,300 | 1,400 | 6,300 | 2,000
Selling, General and Administrative Expenses |  |  |  |
Rent expense | $ 300 | $ 200 | $ 500 | $ 400

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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
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