Equity (Details) - USD ($) $ in Thousands		3 Months Ended
		Apr. 30, 2017	Apr. 30, 2016
Beginning Balance		$ 473,993	$ 441,147
Net income (loss)		(4,159)	3,337
Dividends		(2,982)	(2,983)
Stock repurchase		(1,028)	(943)
Stock options exercised		(692)
Stock options exercised, net of tax			(1,307)
Supplemental executive retirement plan		32	84
Stock-based compensation expense		1,243	2,409
Net unrealized gain (loss) on investments, net of tax (benefit)		(12)	6
Net change in effective portion of hedging contracts, net of tax benefit		(145)	(232)
Foreign currency translation adjustments	[1]	(1,730)	17,900
Ending Balance		464,520	459,418
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
Class A Common Stock
Beginning Balance	[3]	66	66
Stock options exercised	[3]	1
Ending Balance	[3]	67	66
Capital in Excess of Par Value
Beginning Balance		185,354	178,118
Stock options exercised		(1)
Stock options exercised, net of tax			(49)
Supplemental executive retirement plan		32	84
Stock-based compensation expense		1,243	2,409
Ending Balance		186,628	180,562
Retained Earnings
Beginning Balance		415,919	392,788
Net income (loss)		(4,159)	3,308
Dividends		(2,982)	(2,983)
Ending Balance		408,778	393,113
Treasury Stock
Beginning Balance		(204,398)	(199,195)
Stock repurchase		(1,028)	(943)
Stock options exercised		(693)
Stock options exercised, net of tax			(1,259)
Ending Balance		(206,119)	(201,397)
Accumulated Other Comprehensive Income
Beginning Balance		76,780	68,505
Net unrealized gain (loss) on investments, net of tax (benefit)		(12)	6
Net change in effective portion of hedging contracts, net of tax benefit		(145)	(232)
Foreign currency translation adjustments	[1]	(1,730)	17,892
Ending Balance		$ 74,893	86,171
Noncontrolling Interests
Beginning Balance			595
Net income (loss)			29
Foreign currency translation adjustments	[1]		8
Ending Balance			$ 632

[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.