Fair Value Measurements Assets and Liabilities Accounted for at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Feb. 29, 2016	Feb. 28, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	$ 800	$ 500
Total assets measured at fair value on a recurring basis	800	500
Level 3 Significant Unobservable Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	800	500
Total assets measured at fair value on a recurring basis	$ 800	$ 500