Repurchase of Common Stock - Additional Information (Detail) (USD $)	3 Months Ended		12 Months Ended
	Feb. 28, 2015	Nov. 30, 2013	May 31, 2014	Oct. 01, 2013	Jun. 23, 2014
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount				$ 25,000,000
Stock repurchased and retired during period, shares	546,977	369,900
Stock repurchased and retired during period, value	21,100,000	13,300,000
Prior Periods
Equity, Class of Treasury Stock [Line Items]
Stock repurchased and retired during period, shares			89,569
Stock repurchased and retired during period, value			1,300,000
Maximum
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount					50,000,000
Share Repurchase Plan
Equity, Class of Treasury Stock [Line Items]
Remaining stock available to repurchase	15,500,000
Share Repurchase Plan | Common Stock
Equity, Class of Treasury Stock [Line Items]
Common stock share purchase, reduction			100,000
Share Repurchase Plan | Additional Paid-in Capital
Equity, Class of Treasury Stock [Line Items]
Common stock share purchase, reduction			2,200,000
Share Repurchase Plan | Retained Earnings
Equity, Class of Treasury Stock [Line Items]
Common stock share purchase, reduction			$ 12,300,000