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Equity (Details) (Parenthetical) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Dividends per share $ 0 $ 0.20
Net unrealized gain (loss) on investments, net of tax benefit $ 13 $ 0
Amortization of prior service cost, tax provision $ 4 $ 4
Common Stock Class Undefined    
Common Stock, Voting Rights Each share of common stock is entitled to one vote per share on all matters submitted to a vote of the shareholders.  
Class A Common Stock    
Common Stock, Voting Rights Each share of common stock is entitled to one vote per share on all matters submitted to a vote of the shareholders.  
Common stock, Conversion basis Each share of class A common stock is entitled to 10 votes per share on all matters submitted to a vote of the shareholders. Each holder of class A common stock is entitled to convert, at any time, any and all of such shares into the same number of shares of common stock. Each share of class A common stock is converted automatically into common stock in the event that the beneficial or record ownership of such shares of class A common stock is transferred to any person, except to certain family members or affiliated persons deemed “permitted transferees” pursuant to the Company’s Restated Certificate of Incorporation as amended.