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Earnings Per Share and Cash Dividends - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jul. 31, 2020	Apr. 30, 2020	Jul. 31, 2019	Apr. 30, 2019	Jul. 31, 2020	Jul. 31, 2019
Earnings Per Share Diluted [Line Items]
Dilutive common stock equivalents were excluded from the computation of diluted earnings per share	960,000		410,000		921,000	222,000
Cash dividend declared and payable	$ 0	$ 0	$ 0.20	$ 0.20		$ 0.40
Dividend paid			$ 4,600	$ 4,600		$ 9,196
Dividend payable date			Jun. 25, 2019	Apr. 24, 2019
Stock Options
Earnings Per Share Diluted [Line Items]
Dilutive common stock equivalents were excluded from the computation of diluted earnings per share	41,000				84,000