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REVENUES FROM CONTRACTS WITH CUSTOMERS (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 31, 2023 | Oct. 31, 2022 | Oct. 31, 2023 | Oct. 31, 2022 | Jan. 31, 2023
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Revenue recognized | $ 53.8 | $ 48.7 | $ 94.2 | $ 127.6 |
Retained amounts by project owners | $ 19.2 |  | $ 19.2 |  | $ 49.1
Amounts of unpriced change orders included in transaction prices | 6.7 |  | 6.7 |  | 11.6
Kilroot Project | APC |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Estimated loss | $ 7.9 |  |  |  |
Estimated loss, including reversal of net gross profit | 10.7 |  | $ 11.5 |  |
Reversal of profit | $ 2.8 |  | $ 3.6 |  |

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-8 + Details
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