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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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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Amount of loss from the write-down of an asset representing the 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 - Additional Information (Detail) (USD $)	3 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Jan. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 5,620,000us-gaap_Goodwill		$ 5,594,000us-gaap_Goodwill
Goodwill impairment	0us-gaap_GoodwillImpairmentLoss
Aggregate amortization expense	$ 423,000us-gaap_AmortizationOfIntangibleAssets	$ 160,000us-gaap_AmortizationOfIntangibleAssets
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life of intangible assets	15 years
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life of intangible assets	8 years