Equity (Details) - USD ($) $ in Thousands		3 Months Ended
		Apr. 30, 2016	Apr. 30, 2015
Beginning Balance		$ 441,147	$ 484,285
Net income		3,337	3,641
Dividends		(2,983)	(2,636)
Stock repurchase		(943)	(22,154)
Stock options exercised, net of tax (benefit)		(1,307)	(471)
Supplemental executive retirement plan		84	100
Stock-based compensation expense		2,409	1,520
Net unrealized gain on investments, net of tax		6	10
Net change in effective portion of hedging contracts, net of tax benefit		(232)	(508)
Foreign currency translation adjustments	[1]	17,900	(3,137)
Ending Balance		459,418	460,650
Common Stock Class Undefined
Beginning Balance	[2]	270	268
Stock options exercised, net of tax (benefit)	[2]	1	1
Ending Balance	[2]	271	269
Class A Common Stock
Beginning Balance	[3]	66	66
Ending Balance	[3]	66	66
Capital in Excess of Par Value
Beginning Balance		178,118	174,826
Stock options exercised, net of tax (benefit)		(49)	78
Supplemental executive retirement plan		84	100
Stock-based compensation expense		2,409	1,520
Ending Balance		180,562	176,524
Retained Earnings
Beginning Balance		392,788	358,006
Net income		3,308	3,622
Dividends		(2,983)	(2,636)
Ending Balance		393,113	358,992
Treasury Stock
Beginning Balance		(199,195)	(149,811)
Stock repurchase		(943)	(22,154)
Stock options exercised, net of tax (benefit)		(1,259)	(550)
Ending Balance		(201,397)	(172,515)
Accumulated Other Comprehensive Income
Beginning Balance		68,505	98,854
Net unrealized gain on investments, net of tax		6	10
Net change in effective portion of hedging contracts, net of tax benefit		(232)	(508)
Foreign currency translation adjustments	[1]	17,892	(3,135)
Ending Balance		86,171	95,221
Noncontrolling Interests
Beginning Balance		595	2,076
Net income		29	19
Foreign currency translation adjustments	[1]	8	(2)
Ending Balance		$ 632	$ 2,093

[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.