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Equity (Details) (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2018
Jul. 31, 2017
Net unrealized gain on investments, tax (benefit) $ 14 $ 6 $ 19 $ 0
Net change in effective portion of hedging contracts, (benefit) tax $ (5) $ (53) $ (20) $ (79)
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 class A common stock is entitled to 10 votes 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.