Hedging Instruments - Additional Information (Detail) (USD $)	12 Months Ended
	Jan. 31, 2015		Jan. 31, 2014	Jan. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Payment for settlement of interest rate swaps	$ 4,180,000		$ 0	$ 29,335,000
Expected approximately amount of net pre-tax derivative gains included in accumulated other comprehensive income that will be reclassified into earnings within the next 12 months	13,351,000
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	77,314,000
Foreign Exchange Contract [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	160,245,000
Platinum [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount of precious metal hedge	14,800
Silver [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount of precious metal hedge	459,000
Gold [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount of precious metal hedge	50,100
Maximum [Member] | Foreign Exchange Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Term of Contract	12 months
Maximum [Member] | Precious Metal Forward Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Term of Contract	12 months
2012 4.40% Series B Notes, due July 2042 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Debt Instrument, Face Amount				250,000,000
Other income, net [Domain] | Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ 10,484,000	[1]

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