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Earnings Per Share and Cash Dividends - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
Earnings Per Share Diluted [Line Items]
Dilutive common stock equivalents were excluded from the computation of diluted earnings per share	891,000	78,000
Cash dividend declared and payable	$ 0	$ 0.20
Dividend declared date		Mar. 28, 2019
Dividend payable date		Apr. 24, 2019
Dividend record date		Apr. 10, 2019
Dividend paid		$ 4,591
Stock Options
Earnings Per Share Diluted [Line Items]
Dilutive common stock equivalents were excluded from the computation of diluted earnings per share	120,000

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