Fair Value Measurements Reconciliation of Beginning and Ending Balances for Fair Value Measurements using Significant Unobservable Inputs (Details) - Available For Sale Securities - USD ($) $ in Thousands	6 Months Ended
	Aug. 31, 2015	Aug. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 500	$ 6,750
Purchases	0	0
Ending Balance	$ 500	$ 6,750