Shareholders' Equity - Changes in Shareholders' Equity (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Nov. 30, 2015	Nov. 30, 2014	Nov. 30, 2015	Nov. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, Amount			$ 284,680
Beginning Balance, Shares			30,053,443
Net earnings	$ 10,674	$ (71,179)	$ 30,891	$ (53,131)
Foreign currency translation, net of deferred tax of $1,869	223	$ (1,606)	(3,052)	$ (1,071)
Dividends paid ($.525 per share)			(13,528)
Stock based compensation			983
Ending Balance, Amount	$ 299,974		$ 299,974
Ending Balance, Shares	30,053,443		30,053,443
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, Amount			$ 75,134
Beginning Balance, Shares			30,053,443
Ending Balance, Amount	$ 75,134		$ 75,134
Ending Balance, Shares	30,053,443		30,053,443
Additional Paid-in Capital [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, Amount			$ 121,687
Stock based compensation			983
Exercise of stock options and restricted stock grants			(1,352)
Ending Balance, Amount	$ 121,318		121,318
Retained Earnings [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, Amount			188,413
Net earnings			30,891
Dividends paid ($.525 per share)			(13,528)
Ending Balance, Amount	205,776		205,776
Accumulated Other Comprehensive Income (Loss) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, Amount			(22,197)
Foreign currency translation, net of deferred tax of $1,869			(3,052)
Ending Balance, Amount	(25,249)		(25,249)
Treasury Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, Amount			$ (78,357)
Beginning Balance, Treasury Stock, Shares			(4,514,905)
Exercise of stock options and restricted stock grants			$ 1,352
Exercise of stock options and restricted stock grants, shares			77,900
Ending Balance, Amount	$ (77,005)		$ (77,005)
Ending Balance, Treasury Stock, Shares	(4,437,005)		(4,437,005)