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ACCOUNTS RECEIVABLE (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017
ACCOUNTS RECEIVABLE
Contract payment amounts retained by project owners	$ 70.1	$ 36.2
Provision for uncollectible accounts and notes receivable	0.3	1.2
Allowance for uncollectible accounts	0.1	$ 1.9
APC
ACCOUNTS RECEIVABLE
Write-off a receivable	$ 0.8

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

+ References

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Amount of direct write-downs of accounts receivable charged against the allowance.

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Amount billed to customers under long-term contracts or programs that have been withheld because of retainage provisions in a contract.

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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