Stockholders' Equity - Additions to and Reclassifications out of Accumulated Other Comprehensive Earnings (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jul. 31, 2013		Jul. 31, 2012		Jul. 31, 2013		Jul. 31, 2012
Additions To And Reclassification Out Of Accumulated Other Comprehensive Income [Line Items]
Foreign currency translation adjustments	$ (15,459)		$ (20,967)		$ (33,352)		$ (21,353)
Income tax benefit (expense)	113		(753)		2,568		1,073
Foreign currency adjustments, net of tax	(15,346)		(21,720)		(30,784)		(20,280)
Unrealized (loss) gain on marketable securities	(1,076)		5		190		1,102
Income tax benefit (expense)	156		(3)		(295)		(386)
Unrealized (loss) gain on marketable securities, net of tax	(920)		2		(105)		716
Unrealized (loss) gain on hedging instruments	(2,232)		(27,582)		3,238		(30,371)
Income tax benefit (expense)	1,662		8,993		(139)		8,995
Unrealized gain on hedging instruments, net of tax	(2,977)		(14,576)		(190)		(13,613)
Amortization of net loss included in net earnings	4,315	[1]	3,907	[1]	9,611	[1]	7,993	[1]
Amortization of prior service cost included in net earnings	78	[1]	89	[1]	156	[1]	178	[1]
Income tax expense	(1,681)		(1,546)		(4,131)		(3,166)
Net unrealized gain on benefit plans, net of tax	2,712		2,450		5,636		5,005
Total other comprehensive (loss) earnings, net of tax	(16,531)		(33,844)		(25,443)		(28,172)
Cost of sales [Member] | Interest and other expenses, net [Member]
Additions To And Reclassification Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassification adjustment for (gain) loss included in net earnings	$ (2,407)	[2]	$ 4,013	[2]	$ (3,289)	[2]	$ 7,763	[2]

[1] These accumulated other comprehensive income components are included in the computation of net periodic pension costs (see Note 12. Employee Benefit Plans for additional details).The Company's Board of Directors declared quarterly dividends which totaled $0.34 and $0.32 per share of Common Stock in the three months ended July 31, 2013 and 2012 and $0.66 and $0.61 per share of Common Stock in the six months ended July 31, 2013 and 2012.

[2] These (gains) losses are reclassified into Interest and other expenses and Cost of sales, net (see Note 7. Hedging Instruments for additional details).