Business Acquisitions - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	May 31, 2012
Telmar Network Technology, Inc.
Business Acquisition [Line Items]
Percentage of equity interest acquired	100.00%
Date of acquisition	Dec. 01, 2011
Amount of cash paid in relation to business acquisition	$ 128.9
Total assets acquired	184.2
Goodwill	60.9
Acquired intangible assets	49.9
Liabilities assumed	55.3
DMS
Business Acquisition [Line Items]
Goodwill	$ 60.9