The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Goodwill and Other Intangible Assets (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2017 USD ($)	Oct. 31, 2016 USD ($)	Oct. 31, 2017 USD ($) segment	Oct. 31, 2016 USD ($)	Jan. 31, 2017 USD ($)
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 4,701		$ 4,701		$ 4,444
Number of operating segments \| segment			1
Intangible assets, net	2,763		$ 2,763		$ 3,128
Amortization of intangible assets	$ 200	$ 200	$ 500	$ 600
Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful life			3 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful life			15 years