Accrued Expenses and Other Current Liabilities Accrued Expenses and Other Current Liabilities (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Feb. 28, 2017 USD ($)	Feb. 28, 2019 USD ($) Rate	Feb. 28, 2018 USD ($)	Apr. 28, 2014 € / Contract
Restructuring Charges	$ 0	$ 4,588	$ 0
Other Employee-related Liabilities, Current		3,883
Environmental Exit Costs, Costs Accrued to Date		454
Accrued Sales Commission, Current		$ 640
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum | Rate		20.00%
Compensation Expense, Call/Put Options | Rate		20.00%
Derivative Liability, Fair Value, Gross Liability			3,786
Allocated Share-based Compensation Expense	(1,804)	$ (551)	(868)
Accrued Liabilities for Commissions, Expense and Taxes			711
Accrued Salaries, Current		14,552
Employee-related Liabilities, Current			17,429
Accrued Professional Fees, Current		2,172	1,427
Product Warranty Accrual, Current		3,090	4,261
Contract with Customer, Refund Liability		4,415	0
Accrued Royalties, Current		11,833	10,642
Other Accrued Liabilities, Current		2,427	1,880
Accrued Liabilities, Current		$ 39,129	36,350
Put Option [Member]
Derivative, Price Risk Option Strike Price | € / Contract				3,000,000
Call Option [Member]
Allocated Share-based Compensation Expense	$ (405)		$ (285)
Derivative, Price Risk Option Strike Price | € / Contract				0