Stockholders' Equity - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended		1 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended			3 Months Ended
	Aug. 31, 2012 Vote	Aug. 31, 2011	Apr. 07, 2010 Series A 15% Cumulative Non-Voting Non-Convertible Preferred Stock, Redeemable [Member]	Aug. 31, 2012 Series A 15% Cumulative Non-Voting Non-Convertible Preferred Stock, Redeemable [Member]	May 31, 2012 Series B Voting Convertible Preferred Stock [Member]	Aug. 31, 2012 Series B Voting Convertible Preferred Stock [Member]	Apr. 07, 2010 Series B Voting Convertible Preferred Stock [Member]	Aug. 31, 2012 Series B Voting Convertible Preferred Stock [Member] Estimate of Fair Value, Fair Value Disclosure [Member]	May 31, 2012 Common Stock [Member]
Preferred Stock [Line Items]
Fair value of preferred stock		$ 100	$ 40,000					$ 7,700
Dividend yield on preferred stock (in percentage)			15.00%	6.00%
Preferred stock, shares issued	0						100,000
Preferred stock conversion basis						Ten shares of common stock per one share of Series B Preferred Stock
Number of votes preferred stock holders entitled for each common share	1
Series B preferred stock					100,000
Series B preferred stock converted to common shares									1,000,000