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Valuation and Qualifying Accounts (Parenthetical) (Details) - USD ($)	Jan. 31, 2019	Jan. 31, 2018
Valuation And Qualifying Accounts Disclosure [Line Items]
Retained earnings	$ 431,180,000	$ 388,739,000
Returns | ASU 2014-09 | Adjustments
Valuation And Qualifying Accounts Disclosure [Line Items]
Retained earnings	$ (817,000)

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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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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(30)(a)(3))
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(23)(a)(4))
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
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