CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (PARENTHETICAL) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Dividends per share	$ 0.52	$ 0.52	$ 0.44
Stock options exercised, tax expense		$ 265	$ 31
Net unrealized gain (loss) on investments, tax (benefit)	$ (13)	30	(15)
Net change in effective portion of hedging contracts, tax (benefit)	(9)	(10)	10
Stock-based compensation	4,874	$ 7,281	$ 6,123
Cost Savings Initiatives
Stock-based compensation	$ 1,200
Common Stock Class Undefined
Common Stock, Voting Rights	Each share of common stock is entitled to one vote per share on all matters submitted to a vote of the shareholders.
Class A Common Stock
Common Stock, Voting Rights	Each share of class A common stock is entitled to 10 votes per share on all matters submitted to a vote of the shareholders.
Common stock, Conversion basis	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.