Stockholders' Equity - Additions to and Reclassifications out of Accumulated Other Comprehensive Earnings (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
Additions To And Reclassification Out Of Accumulated Other Comprehensive Income [Line Items]
Foreign currency translation adjustments	$ 19,706		$ 15,029		$ (13,646)		$ (6,324)
Income tax (expense) benefit	(151)		309		2,417		1,382
Foreign currency translation adjustments	19,555		15,338		(11,229)		(4,942)
Unrealized gain on marketable securities	2,595		989		2,785		2,091
Income tax expense	(613)		(348)		(908)		(734)
Unrealized gain on marketable securities, net of tax	1,982		647		1,877		1,363
Unrealized gain (loss) on hedging instruments	2,821		5,658		6,059		(24,713)
Income tax benefit (expense)	595		(3,281)		456		5,714
Unrealized (loss) gain on hedging instruments, net of tax	(1,409)		5,518		(1,599)		(8,095)
Amortization of net loss included in net earnings	4,806	[1]	3,956	[1]	14,417	[1]	11,949	[1]
Amortization of prior service cost included in net earnings	78	[1]	89	[1]	234	[1]	267	[1]
Income tax expense	(1,871)		(1,566)		(6,002)		(4,732)
Net unrealized gain on benefit plans, net of tax	(3,013)		(2,479)		(8,649)		(7,484)
Other comprehensive earnings (loss), net of tax	23,141		23,982		(2,302)		(4,190)
Interest and other expenses, net [Member]
Additions To And Reclassification Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassification adjustment for loss included in net earnings	0	[2]	6	[2]	0	[2]	6	[2]
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	$ (4,825)	[3]	$ 3,141	[3]	$ (8,114)	[3]	$ 10,904	[3]

[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).

[2] These losses are reclassified into Interest and other expenses, net.

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