Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Segment Reporting Information [Line Items]
Aggregate amortization expense	$ 1,800	$ 1,800	$ 1,500
Klein Associates Inc.
Segment Reporting Information [Line Items]
Impairment of indefinite lived intangible assets	$ 760
Goodwill, impairment			$ 1,500