Debt - Additional Information (Detail) (USD $)				1 Months Ended	12 Months Ended
	Aug. 31, 2013	Aug. 31, 2012	Aug. 31, 2013 Maximum [Member]	Jul. 31, 2012 2012 Agreement [Member]	Aug. 31, 2013 2012 Agreement [Member]	Aug. 31, 2013 2012 Agreement [Member] Two Consecutive Quarters [Member]	Aug. 31, 2013 2012 Agreement [Member] Minimum [Member]	Aug. 31, 2013 2012 Agreement [Member] Maximum [Member]	Aug. 31, 2013 2012 Agreement [Member] Maximum [Member] Scenario, Forecast [Member]
Debt Instrument [Line Items]
Maximum borrowing amount under amended and restated credit agreement				$ 130,000,000
Scheduled principal payment				0
Debt instrument maturity date				Jul. 09, 2017
Line of credit, amount outstanding					71,500,000
Debt Instrument, Description of Variable Rate Basis over LIBOR (in percentage)							2.00%	4.00%
Covenant, maximum total leverage ratio permitted through November 30, 2013						2.00			3.50
Covenant, maximum total leverage ratio permitted from December 1, 2013 through May 31, 2014									3.25
Covenant, maximum total leverage ratio permitted after May 31, 2014								3.0
Covenant, fixed coverage ratio							1.35
Covenant, amount of annual capital expenditures permitted								15,000,000
Covenant, dividend declaration permitted								10,000,000
Dividend declared, Percentage of cash flow					50.00%
Capital lease obligations	231,000	423,000
Current portion of capital leases			$ 100,000