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Accounting Pronouncements Recently Adopted (Details) - USD ($) $ in Thousands	Jul. 31, 2018	Jan. 31, 2018	Jul. 31, 2017	Jan. 31, 2017
Changes To Critical Accounting Policies [Line Items]
Cash and cash equivalents	$ 175,583	$ 214,811	$ 162,417
ASU 2016-18
Changes To Critical Accounting Policies [Line Items]
Cash and cash equivalents		214,811		$ 256,279
Restricted funds included in other non-current assets		$ 600		$ 600
Restricted Cash, Noncurrent, Asset, Statement of Financial Position [Extensible List]		us-gaap:OtherNoncurrentAssetsMember		us-gaap:OtherNoncurrentAssetsMember
Beginning of period balance presented in the statement of cash flows		$ 215,411		$ 256,879
ASU 2016-18 | As Previously Reported
Changes To Critical Accounting Policies [Line Items]
Cash and cash equivalents		$ 214,811		$ 256,279
Restricted Cash, Noncurrent, Asset, Statement of Financial Position [Extensible List]		us-gaap:OtherNoncurrentAssetsMember		us-gaap:OtherNoncurrentAssetsMember
Beginning of period balance presented in the statement of cash flows		$ 214,811		$ 256,279

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
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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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Indicates line item in statement of financial position that includes cash restricted to withdrawal or usage, classified as noncurrent.

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