Consolidated Statement Of Shareholders' Equity (USD $) In Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Noncontrolling Interest [Member]	Total
Balance at Jan. 31, 2009	$ 89	$ 775,754	$ (331,692)	$ 1,058,973	$ 234,569	$ 4,320	$ 1,742,013
Balance, Shares at Jan. 31, 2009	59,239
Issuance of treasury stock for benefit plans and equity-based awards exercised, including related tax benefit	0	(17,684)	52,494	0	0	0	34,810
Stock-based compensation expense	0	11,225	0	0	0	0	11,225
Currency translation adjustment	0	0	0	0	125,012	273	125,285
Net income	0	0	0	180,155	0	1,045	181,200
Balance at Jan. 31, 2010	89	769,295	(279,198)	1,239,128	359,581	5,638	2,094,533
Balance, Shares at Jan. 31, 2010	59,239
Purchase of treasury stock, at cost	0	0	(200,000)	0	0	0	(200,000)
Issuance of treasury stock for benefit plans and equity-based awards exercised, including related tax benefit	0	(10,425)	12,563	0	0	0	2,138
Stock-based compensation expense	0	9,887	0	0	0	0	9,887
Capital contributions from joint venture partner	0	0	0	0	0	13,620	13,620
Currency translation adjustment	0	0	0	0	(697)	83	(614)
Net income	0	0	0	214,243	0	4,620	218,863
Balance at Jan. 31, 2011	89	768,757	(466,635)	1,453,371	358,884	23,961	2,138,427
Balance, Shares at Jan. 31, 2011	59,239
Purchase of treasury stock, at cost	0	0	(314,886)	0	0	0	(314,886)
Issuance of treasury stock for benefit plans and equity-based awards exercised, including related tax benefit	0	(9,630)	41,907	0	0	0	32,277
Stock-based compensation expense	0	10,699	0	0	0	0	10,699
Currency translation adjustment	0	0	0	0	(75,129)	(1,535)	(76,664)
Declaration of return of capital to joint venture partner	0	0	0	0	0	(4,553)	(4,553)
Net income	0	0	0	206,396	0	10,452	216,848
Balance at Jan. 31, 2012	$ 89	$ 769,826	$ (739,614)	$ 1,659,767	$ 283,755	$ 28,325	$ 2,002,148
Balance, Shares at Jan. 31, 2012	59,239