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Fair Value Measurements - Maturities of Available-for-sale marketable securities (Details) (USD $) In Millions, unless otherwise specified	Aug. 31, 2013
Fair Value Disclosures [Abstract]
Available-for-sale Securities, Debt Maturities, within One Year, Amortized Cost Basis	$ 4.2
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value	4.2
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Amortized Cost Basis	6.7
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value	6.7
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis	0.1
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value	0.1
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	$ 11.0

X

- Definition

Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at fair value maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year.

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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