Significant Accounting Policies and General Matters - Additional Information (Detail) - Accounting Standards Update 2017-07 [Member]	3 Months Ended
	May 31, 2017 USD ($)
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	$ (73,000)
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	(56,000)
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