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Stock-based Compensation (Details 4) (USD $) In Millions, except Share data in Thousands, unless otherwise specified			12 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2012 Restricted stock unit	Aug. 31, 2011 Restricted stock unit	Aug. 31, 2012 Stock options	Aug. 31, 2011 Stock options	Aug. 31, 2010 Stock options Nonemployees
Number of Stock Units Outstanding
Outstanding at the beginning of the period (in shares)			317
Granted (in shares)			860	346
Vested (in shares)			(127)
Forfeited (in shares)			(120)	(29)
Outstanding at the end of the period (in shares)			930	317
Weighted-Average Grant Date Fair Value
Outstanding at the beginning of the period (in dollars per share)			$ 17.00
Granted (in dollars per share)			$ 3.46	$ 17.17
Vested (in dollars per share)			$ 18.10
Forfeited (in dollars per share)			$ 10.67	$ 19.00
Outstanding at the end of the period (in dollars per share)			$ 5.15	$ 17.00
Additional information on stock units awards
Unrecognized compensation cost related to unvested restricted stock unit awards			$ 3.3	$ 3.0
Weighted-average remaining period over which expense will be recognized			3 years	3 years 6 months	2 years 3 months 18 days	3 years 3 months 18 days
General information
Outstanding shares of common stock subject to repurchase	1	3
Vesting period							4 years

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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