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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Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Jan. 31, 2020
Segment Reporting Information [Line Items]
Impairment of intangible assets	$ 0
Aggregate amortization expense	460,000	$ 454,000
Seamap
Segment Reporting Information [Line Items]
Goodwill, impairment	$ 2,500,000
Klein Associates Inc.
Segment Reporting Information [Line Items]
Impairment of indefinite lived intangible assets			$ 760,000