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Acquisitions (Narrative)(Details) (USD $) In Millions, unless otherwise specified	Aug. 31, 2011	Aug. 26, 2011 IRZ Consulting, LLC [Member]	Nov. 03, 2010 WMC Technology Limited [Member]	Aug. 31, 2010 Digitec, Inc [Member]
Restructuring Cost and Reserve [Line Items]
Total consideration paid		$ 4.9	$ 1.3	$ 6.4
Current assets	0.9			1.1
Business acquisition allocation, cash				0.1
Finite-lived intangible assets	1.6
Indefinite-lived intangible assets	1.0
Goodwill	1.0			4.4
Other long-term assets	1.1
Current liabilities	0.4			0.5
Long-term liabilities	0.8			0.9
Intangible assets				1.5
Fixed assets				$ 0.8