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Fair Value of Financial Assets and Liabilities on a Recurring Basis (Detail) - USD ($)
$ in Thousands
Oct. 31, 2015
Jan. 31, 2015
Nov. 01, 2014
Level 1 | Executive Savings Plan Investments      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value measured on recurring basis, Assets $ 164,970 $ 151,936 $ 153,917
Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Foreign currency exchange contracts, Assets 13,801 39,419 20,845
Foreign currency exchange contracts, Liabilities 2,396 1,942 3,514
Level 2 | Diesel Fuel Contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value measured on recurring basis, Liabilities 10,437 15,324 5,360
Level 2 | Short-Term Investments      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value measured on recurring basis, Assets $ 399,714 $ 282,623 $ 277,225