Assets and Liabilities Accounted for at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	May 31, 2013	Feb. 28, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	$ 6,739	$ 6,489
Total assets measured at fair value on a recurring basis	6,739	6,489
Interest rate swap agreement	63	107
Total liabilities measured at fair value on a recurring basis	63	107
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities
Total assets measured at fair value on a recurring basis
Interest rate swap agreement
Total liabilities measured at fair value on a recurring basis
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities
Total assets measured at fair value on a recurring basis
Interest rate swap agreement	63	107
Total liabilities measured at fair value on a recurring basis	63	107
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	6,739	6,489
Total assets measured at fair value on a recurring basis	6,739	6,489
Interest rate swap agreement
Total liabilities measured at fair value on a recurring basis