Hedging Instruments - Information on Location and Amounts of Derivative Gains and Losses in Consolidated Financial Statements (Detail) (Cash Flow Hedging [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2015		Jan. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Pre-Tax Gain (Loss) Gain Recognized in OCI (Effective Portion)	$ 14,620		$ 8,716
Gain (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion)	13,027		13,950
Foreign Exchange Contract [Member] | Cost of sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Pre-Tax Gain (Loss) Gain Recognized in OCI (Effective Portion)	23,225		16,184
Gain (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion)	18,717	[1]	17,660	[1]
Put option contracts [Member] | Cost of sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Pre-Tax Gain (Loss) Gain Recognized in OCI (Effective Portion)	0		1,241
Gain (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion)	0	[1]	2,201	[1]
Precious Metal Forward Contracts [Member] | Cost of sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Pre-Tax Gain (Loss) Gain Recognized in OCI (Effective Portion)	(4,428)		(8,709)
Gain (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion)	(4,173)	[1]	(4,376)	[1]
Forward-starting interest rate swaps [Member] | Interest expense and financing costs [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Pre-Tax Gain (Loss) Gain Recognized in OCI (Effective Portion)	(4,177)		0
Gain (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion)	$ (1,517)	[2]	$ (1,535)	[2]

[1] The gain or loss recognized in earnings is included within Cost of sales.

[2] The gain or loss recognized in earnings is included within Interest expense and financing costs.