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Fair Value (Detail) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2013
Jan. 31, 2013
Cash Equivalents $ 2 $ 2
Money Market Mutual Fund 300 [1] 300 [1]
Investment in Cooperative 252 [1] 252 [1]
Total Assets 554 554
Interest rate swap derivative liability 2,345 2,789
Fair Value, Inputs, Level 1 [Member]
    
Cash Equivalents 2 2
Money Market Mutual Fund 300 [1] 300 [1]
Total Assets 302 302
Fair Value, Inputs, Level 2 [Member]
    
Interest rate swap derivative liability 2,345 2,789
Fair Value, Inputs, Level 3 [Member]
    
Investment in Cooperative 252 [1] 252 [1]
Total Assets $ 252 $ 252
[1] The money market mutual fund is included in "Restricted investments and deposits" and the investment in cooperative is included in "Other assets" on the accompanying Consolidated Balance Sheets.