Business Acquisitions - Additional Information (Detail) (USD $) In Millions, unless otherwise specified		3 Months Ended	12 Months Ended
	Feb. 28, 2011 Employee	Feb. 28, 2011 Competence sites	Aug. 31, 2012 Telmar Network Technology, Inc.	Dec. 01, 2011 Telmar Network Technology, Inc.	Aug. 31, 2012 DMS	Feb. 28, 2011 E&I Competence sites
Business Acquisition [Line Items]
Percentage of equity interest acquired		100.00%		100.00%
Date of acquisition			Dec. 01, 2011
Business acquisition amount of cash paid		$ 0.5		$ 128.9
Assets acquired		131.4	184.2
Goodwill			60.9		60.9	7.1
Acquired intangible assets			49.9
Liabilities assumed		108.6	55.3
Number of employees added	1,500
Settlement of pre-existing receivables and other relationships at fair value		22.3
Charge recognized prior to acquisition		12.7
Receivables and other relationships recorded at fair value		$ 35.0