Significant Accounting Policies and General Matters - Additional Information (Detail) - Accounting Standards Update 2017-07 [Member] - USD ($)	3 Months Ended	6 Months Ended
	Aug. 31, 2017	Aug. 31, 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)	$ (145,000)
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	(58,000)	(114,000)
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	$ 130,000	$ 259,000