INCOME TAXES (Deferred Tax Assets) (Details) - USD ($) $ in Thousands	Feb. 28, 2017	Feb. 29, 2016
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 23,751	$ 10,660
Depreciation, amortization and impairments	(21,959)	1,598
Research and development credits	12,307	9,747
Stock-based compensation	2,855	2,383
Other tax credits	3,650	917
Inventory reserve	903	502
Warranty reserve	670	752
Payroll and employee benefit accruals	3,012	2,421
Allowance for doubtful accounts	961	241
Other accured liabilities	6,738	2,694
Other, net	1,203	(84)
Gross deferred tax assets	34,091	31,831
Valuation allowance	(6,587)	(1,618)
Net deferred tax assets	$ 27,504	$ 30,213