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	Jan. 31, 2021	Jan. 31, 2020
Segment Reporting Information [Line Items]
Aggregate amortization expense		$ 1,800,000	$ 1,800,000
Seamap
Segment Reporting Information [Line Items]
Impairment of intangible assets		0
Goodwill, impairment	$ 2,500,000
Klein Associates Inc.
Segment Reporting Information [Line Items]
Impairment of intangible assets		0
Impairment of indefinite lived intangible assets		$ 760,000