Fair Value of Financial Instruments - Additional Information (Detail) (USD $)	Jan. 31, 2014	Jan. 31, 2013
Debt Disclosure [Abstract]
The total carrying value of short-term borrowings and long-term debt	$ 1,003,519,000	$ 959,272,000
Total fair value of short-term borrowings and long-term debt	$ 1,100,000,000	$ 1,100,000,000