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Notes Payable - Principal Amount, Unamortized Debt Discount, Net Carrying Amount of the Liability Component, and Carrying Amount of the Equity Component of the 4.00% Debentures (Detail) (4.00% Debentures due 2031, USD $)
In Thousands, unless otherwise specified
Oct. 31, 2014
Jan. 31, 2014
4.00% Debentures due 2031
   
Debt Instrument    
Principal amount $ 253,000 $ 253,000
Unamortized debt discount (24,176) (28,739)
Net carrying amount of the liability component 228,824 224,261
Equity component $ 43,930 $ 43,930