BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - IMPACT OF ASU 2016-18 (Details) - USD ($) $ in Thousands	6 Months Ended
Jul. 31, 2018	Jul. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Cash Provided by Operating Activities		$ 98,510
Net Cash Used in Investing Activities		(38,121)
Net Cash Provided By Financing Activities		389
Effect of Exchange Rate on Cash and Cash Equivalents, Continuing Operations		730
Net increase in cash, cash equivalents, restricted cash and restricted cash equivalents	$ 14,495	61,508
Cash, cash equivalents, restricted cash and restricted cash equivalents - beginning of period	398,210	369,329
Cash, cash equivalents, restricted cash and restricted cash equivalents - end of period	$ 412,705	430,837
As Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Cash Provided by Operating Activities		98,510
Net Cash Used in Investing Activities		(41,853)
Net Cash Provided By Financing Activities		389
Effect of Exchange Rate on Cash and Cash Equivalents, Continuing Operations		729
Net increase in cash, cash equivalents, restricted cash and restricted cash equivalents		57,775
Cash, cash equivalents, restricted cash and restricted cash equivalents - beginning of period		307,363
Cash, cash equivalents, restricted cash and restricted cash equivalents - end of period		365,138
Accounting Standards Update 2016-18
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Cash Provided by Operating Activities		0
Net Cash Used in Investing Activities		3,732
Net Cash Provided By Financing Activities		0
Effect of Exchange Rate on Cash and Cash Equivalents, Continuing Operations		1
Net increase in cash, cash equivalents, restricted cash and restricted cash equivalents		3,733
Cash, cash equivalents, restricted cash and restricted cash equivalents - beginning of period		61,966
Cash, cash equivalents, restricted cash and restricted cash equivalents - end of period		$ 65,699

Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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