Significant Accounting Policies and General Matters - Additional Information (Detail) - Accounting Standards Update 2017-07 [Member] - USD ($)	3 Months Ended	9 Months Ended
	Nov. 30, 2017	Nov. 30, 2017
Cost of Sales [Member]
Basis Of Presentation And Significant Accounting Policies [Line Items]
New accounting pronouncement or change in accounting principle, effect of change on operating results	$ (72,000)	$ (217,000)
Selling, General and Administrative Expenses [Member]
Basis Of Presentation And Significant Accounting Policies [Line Items]
New accounting pronouncement or change in accounting principle, effect of change on operating results	(57,000)	(171,000)
Other Expense [Member]
Basis Of Presentation And Significant Accounting Policies [Line Items]
New accounting pronouncement or change in accounting principle, effect of change on operating results	$ 129,000	$ 388,000