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Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2018
Jul. 31, 2017
Beginning Balance     $ 470,335 $ 473,993
Net income     17,255 1,323
Dividends     (9,229) (5,967)
Adoption of new revenue recognition Standard ( Topic 606)     (724)  
Stock repurchase     (2,057) (1,655)
Stock options exercised     4,825 (733)
Supplemental executive retirement plan     67 66
Stock-based compensation expense     2,823 2,433
Net unrealized gain on investments, net of tax (benefit)     64 1
Net change in effective portion of hedging contracts, net of tax (benefit) $ 23 $ (266) (104) (411)
Foreign currency translation adjustments (4,675) 10,838 (19,901) [1] 9,108 [1]
Ending Balance 463,354 478,158 463,354 478,158
Common Stock Class Undefined        
Beginning Balance [2]     273 272
Stock options exercised [2]     3 1
Ending Balance [2] 276 273 276 273
Class A Common Stock        
Beginning Balance [3]     66 66
Stock options exercised [3]       1
Ending Balance [3] 66 67 66 67
Capital in Excess of Par Value        
Beginning Balance     189,808 185,354
Stock options exercised     5,548 (1)
Supplemental executive retirement plan     67 66
Stock-based compensation expense     2,823 2,433
Ending Balance 198,246 187,852 198,246 187,852
Retained Earnings        
Beginning Balance     388,739 415,919
Net income     17,255 1,323
Dividends     (9,229) (5,967)
Adoption of new revenue recognition Standard ( Topic 606)     (724)  
Ending Balance 396,041 411,275 396,041 411,275
Treasury Stock        
Beginning Balance     (208,894) (204,398)
Stock repurchase     (2,057) (1,655)
Stock options exercised     (726) (734)
Ending Balance (211,677) (206,787) (211,677) (206,787)
Accumulated Other Comprehensive Income        
Beginning Balance     100,343 76,780
Net unrealized gain on investments, net of tax (benefit)     64 1
Net change in effective portion of hedging contracts, net of tax (benefit)     (104) (411)
Foreign currency translation adjustments [1]     (19,901) 9,108
Ending Balance $ 80,402 $ 85,478 $ 80,402 $ 85,478
[1] The currency translation adjustment is not adjusted for income taxes to the extent that it relates to permanent investments of earnings in international subsidiaries.
[2] Each share of common stock is entitled to one vote per share on all matters submitted to a vote of the shareholders.
[3] 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. The class A common stock is not publicly traded, and consequently, there is currently no established public trading market for these shares.