Segment Information - Company's Segments Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Net sales:
Net sales	$ 911,478	$ 852,741	$ 2,732,846	$ 2,558,480
Earnings (losses) from operations:
Earnings (losses) from operations	184,115	147,916	574,075	499,948
Americas [Member]
Net sales:
Net sales	416,748	400,113	1,268,301	1,219,776
Earnings (losses) from operations:
Earnings (losses) from operations	61,662	51,890	208,355	191,697
Asia-Pacific [Member]
Net sales:
Net sales	238,412	187,685	670,164	556,893
Earnings (losses) from operations:
Earnings (losses) from operations	59,975	36,589	165,316	122,675
Japan [Member]
Net sales:
Net sales	128,300	146,723	409,222	447,175
Earnings (losses) from operations:
Earnings (losses) from operations	46,528	42,732	148,182	135,558
Europe [Member]
Net sales:
Net sales	104,488	97,644	308,721	285,765
Earnings (losses) from operations:
Earnings (losses) from operations	17,672	16,119	54,288	53,371
Total reportable segments [Member]
Net sales:
Net sales	887,948	832,165	2,656,408	2,509,609
Earnings (losses) from operations:
Earnings (losses) from operations	185,837	147,330	576,141	503,301
Other [Member]
Net sales:
Net sales	23,530	20,576	76,438	48,871
Earnings (losses) from operations:
Earnings (losses) from operations	$ (1,722)	$ 586	$ (2,066)	$ (3,353)