SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - UNBILLED ACCOUNTS RECEIVABLE (Details) - USD ($) $ in Millions	Jan. 31, 2018	Jan. 31, 2017
Unbilled Receivables, Not Billable, Fiscal Year Maturity [Abstract]
Unbilled Receivables, Not Billable, Amount Expected to be Collected in Next Twelve Months	$ 65.9	$ 39.7

Amount of receivables under long-term contracts that have not been billed and were not billable that are expected to be collected in the next fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

No definition available.

Name:	us-gaap_UnbilledReceivablesNotBillableAtBalanceSheetDateAmountExpectedToBeCollectedWithinOneYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant