Reconciliation of Basic and Diluted Earnings per Common Share (Detail) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 31, 2012		Aug. 31, 2011		Aug. 31, 2010
Earnings Per Share Disclosure [Line Items]
Weighted average basic common shares outstanding	26,572	[1]	24,100	[1]	18,585	[1]
Dilutive effect of employee stock options					6
Dilutive effect of warrants	1,101		2,401		1,622
Dilutive effect of convertible notes	6,045	[2]
Weighted average diluted common shares outstanding	33,718		26,501		20,213

[1] Restricted stock grants are treated as outstanding when issued and are included in weighted average basic common shares outstanding when the Company is in a net earnings position.

[2] In 2012, the dilutive effect of the 2018 Convertible notes are included as they were considered dilutive under the "if converted" method. In 2011, the dilutive effect of the 2.5 million weighted average shares underlying the 2018 Convertible Notes was excluded from the share calculation as it was the less dilutive of two approaches. See Note 2 - Summary of Significant Accounting Policies for a description of the Company's net earnings per share calculations. The dilutive effect of the 2026 Convertible notes was excluded from the share calculations as the stock price for each year presented was less than the initial conversion price of $48.05 and therefore considered anti-dilutive.