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Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Jul. 31, 2016
Jul. 31, 2015
Beginning Balance     $ 441,147 $ 484,285
Net income $ 6,355 $ 11,933 9,692 15,573
Dividends     (5,970) (5,239)
Stock repurchase     (2,858) (39,129)
Stock options exercised, net of tax (benefit)     (1,408) (447)
Supplemental executive retirement plan     119 137
Stock-based compensation expense     4,026 3,100
Net unrealized gain on investments, net of tax (benefit) (4) 5 2 15
Net change in effective portion of hedging contracts, net of tax 306 504 74 (4)
Foreign currency translation adjustments (3,092) (10,070) 14,808 [1] (13,207) [1]
Ending Balance 459,632 445,084 459,632 445,084
Common Stock Class Undefined        
Beginning Balance [2]     270 268
Stock options exercised, net of tax (benefit) [2]     1 1
Ending Balance [2] 271 269 271 269
Class A Common Stock        
Beginning Balance [3]     66 66
Ending Balance [3] 66 66 66 66
Capital in Excess of Par Value        
Beginning Balance     178,118 174,826
Stock options exercised, net of tax (benefit)     (78) 188
Supplemental executive retirement plan     119 137
Stock-based compensation expense     4,026 3,100
Ending Balance 182,185 178,251 182,185 178,251
Retained Earnings        
Beginning Balance     392,788 358,006
Net income     9,614 15,674
Dividends     (5,970) (5,239)
Ending Balance 396,432 368,441 396,432 368,441
Treasury Stock        
Beginning Balance     (199,195) (149,811)
Stock repurchase     (2,858) (39,129)
Stock options exercised, net of tax (benefit)     (1,331) (636)
Ending Balance (203,384) (189,576) (203,384) (189,576)
Accumulated Other Comprehensive Income        
Beginning Balance     68,505 98,854
Net unrealized gain on investments, net of tax (benefit)     2 15
Net change in effective portion of hedging contracts, net of tax     74 (4)
Foreign currency translation adjustments [1]     14,832 (13,321)
Ending Balance 83,413 85,544 83,413 85,544
Noncontrolling Interests        
Beginning Balance     595 2,076
Net income     78 (101)
Foreign currency translation adjustments [1]     (24) 114
Ending Balance $ 649 $ 2,089 $ 649 $ 2,089
[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.