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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (PARENTHETICAL) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
Dividends per share $ 0.52 $ 0.44 $ 0.40
Stock options exercised, tax benefit     $ 1,270
Stock options exercised, tax expense $ 265 $ 31  
Net unrealized gain (loss) on investments, tax 30 (15) 18
Net change in effective portion of hedging contracts, tax (benefit) (10) 10 0
Gain on available-for-sale securities, tax benefit $ 0 $ 0 $ 50
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 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.