REVENUES FROM CONTRACTS WITH CUSTOMERS (Details) - USD ($) $ in Millions	12 Months Ended
Jan. 31, 2023	Jan. 31, 2022	Apr. 30, 2023
REVENUES FROM CONTRACTS WITH CUSTOMERS
Revenue recognized	$ 50.9	$ 67.3
Retained amounts by project owners	$ 49.1		$ 25.0
Amounts of unpriced change orders included in transaction prices	11.6		12.2

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130549-203045

Name:	us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration