Fair Value Measurements Assets and Liabilities Accounted for at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	May. 31, 2015	Feb. 28, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	$ 500	$ 500
Total assets measured at fair value on a recurring basis	500	500
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	500	500
Total assets measured at fair value on a recurring basis	$ 500	$ 500