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Acquisitions (Assets Acquired and Liabilities Assumed) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Nov. 07, 2011
Submittal Exchange [Member]
Oct. 19, 2011
GradeBeam, LLC [Member]
Jan. 31, 2013
PlanSwift, LLC [Member]
Business Acquisition [Line Items]            
Identifiable intangible assets       $ 5,550 $ 3,970 $ 4,570
Goodwill 23,937 17,949 0 11,004 6,945 5,988
Property and equipment       58    
Deferred revenue       (1,640) (1,120) (485)
Other current assets (liabilities), net       383 174 28
Net assets acquired       $ 15,355 $ 9,969 $ 10,101