Business Combinations (Acquisition Date Fair Value Of Total Consideration Transferred) (Details) (USD $) In Thousands	Oct. 31, 2011	Sep. 30, 2011		Jan. 31, 2011
Business Combinations
Cash consideration, net of cash acquired	$ 1,000	$ 92,849	[1]	$ 2,800
Contingent consideration		21,595
Deferred acquisition obligations		16,632	[2]
Total consideration transferred		$ 131,076

[1] Does not include $2.8 million related to an acquisition closed in December 2010 and paid in January 2011.

[2] Includes $1.0 million related to an acquisition closed in September 2011 and paid in October 2011.