Description of Business and Summary of Significant Accounting Policies Accounts Receivable (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Feb. 28, 2017	Feb. 28, 2019	Feb. 28, 2018	Feb. 29, 2016
Proceeds from Sale and Collection of Receivables	$ 141,000	$ 105,000	$ 142,000
Interest Expense, Other	877	929	957
Accounts Receivable, Gross, Current		77,064	84,517
Allowance for Doubtful Accounts Receivable, Current		2,548	2,196
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	$ 1,233	1,125	1,205	$ 1,077
Accounts Receivable, Net, Current		$ 73,391	$ 81,116
Maximum [Member]
Due date of AR, number of days		60 days
Minimum [Member]
Due date of AR, number of days		30 days