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Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2017
Jul. 31, 2016
Beginning Balance     $ 473,993 $ 441,147
Net income $ 5,482 $ 6,355 1,323 9,692
Dividends     (5,967) (5,970)
Stock repurchase     (1,655) (2,858)
Stock options exercised     (733)  
Stock options exercised, net of tax       (1,408)
Supplemental executive retirement plan     66 119
Stock-based compensation expense     2,433 4,026
Net unrealized gain on investments, net of tax (benefit) 13 (4) 1 2
Net change in effective portion of hedging contracts, net of tax (benefit) (266) 306 (411) 74
Foreign currency translation adjustments 10,838 (3,092) 9,108 [1] 14,808 [1]
Ending Balance 478,158 459,632 478,158 459,632
Common Stock Class Undefined        
Beginning Balance [2]     272 270
Stock options exercised [2]     1  
Stock options exercised, net of tax [2]       1
Ending Balance [2] 273 271 273 271
Class A Common Stock        
Beginning Balance [3]     66 66
Stock options exercised [3]     1  
Ending Balance [3] 67 66 67 66
Capital in Excess of Par Value        
Beginning Balance     185,354 178,118
Stock options exercised     (1)  
Stock options exercised, net of tax       (78)
Supplemental executive retirement plan     66 119
Stock-based compensation expense     2,433 4,026
Ending Balance 187,852 182,185 187,852 182,185
Retained Earnings        
Beginning Balance     415,919 392,788
Net income     1,323 9,614
Dividends     (5,967) (5,970)
Ending Balance 411,275 396,432 411,275 396,432
Treasury Stock        
Beginning Balance     (204,398) (199,195)
Stock repurchase     (1,655) (2,858)
Stock options exercised     (734)  
Stock options exercised, net of tax       (1,331)
Ending Balance (206,787) (203,384) (206,787) (203,384)
Accumulated Other Comprehensive Income        
Beginning Balance     76,780 68,505
Net unrealized gain on investments, net of tax (benefit)     1 2
Net change in effective portion of hedging contracts, net of tax (benefit)     (411) 74
Foreign currency translation adjustments [1]     9,108 14,832
Ending Balance $ 85,478 83,413 $ 85,478 83,413
Noncontrolling Interests        
Beginning Balance       595
Net income       78
Foreign currency translation adjustments [1]       (24)
Ending Balance   $ 649   $ 649
[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.