Segment Information (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2011	Jul. 31, 2010
Sales Revenue, Net [Abstract]
Net sales	$ 872,712	$ 668,760	$ 1,633,730	$ 1,302,346
Earnings (losses) from continuing operations:
Earnings from continuing operations for segments	208,121	142,267	382,805	275,235
All non-reportable segments [Member]
Sales Revenue, Net [Abstract]
Net sales	17,397	11,913	27,532	24,228
Earnings (losses) from continuing operations:
Earnings from continuing operations for segments	1,434	862	1,612	1,110
Total reportable segments [Member]
Sales Revenue, Net [Abstract]
Net sales	855,315	656,847	1,606,198	1,278,118
Earnings (losses) from continuing operations:
Earnings from continuing operations for segments	206,687	141,405	381,193	274,125
Americas [Member]
Sales Revenue, Net [Abstract]
Net sales	438,223	350,433	812,875	665,691
Earnings (losses) from continuing operations:
Earnings from continuing operations for segments	94,683	68,970	169,096	123,892
Asia-Pacific [Member]
Sales Revenue, Net [Abstract]
Net sales	173,241	111,490	340,488	233,826
Earnings (losses) from continuing operations:
Earnings from continuing operations for segments	46,706	24,366	95,340	56,540
Japan [Member]
Sales Revenue, Net [Abstract]
Net sales	142,502	118,031	265,860	233,080
Earnings (losses) from continuing operations:
Earnings from continuing operations for segments	41,116	31,228	72,807	62,224
Europe [Member]
Sales Revenue, Net [Abstract]
Net sales	101,349	76,893	186,975	145,521
Earnings (losses) from continuing operations:
Earnings from continuing operations for segments	$ 24,182	$ 16,841	$ 43,950	$ 31,469