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Fair Value Measurement - Additional Information (Detail) - USD ($)
$ in Thousands
Oct. 31, 2016
Jan. 31, 2016
Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis    
Notes payable $ 246,053 $ 240,076
Current portion of notes payable (Note 6) 240,865 0
Non-marketable equity securities 3,000  
4.00% Debentures due 2031    
Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis    
Fair value of notes payable 363,292 255,487
Notes payable 240,865 234,888
Current portion of notes payable (Note 6) 240,865 0
Notes Payable, Other Payables    
Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis    
Notes payable $ 5,188 $ 5,188