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Acquisitions (Detail Textual) - USD ($)
$ in Thousands
Aug. 15, 2018
Sep. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Business Acquisition [Line Items]        
Goodwill   $ 2,661,402 $ 2,620,835 $ 2,577,435
Domestic Acquisition | SE&A BU        
Business Acquisition [Line Items]        
Acquisition date Aug. 15, 2018      
Cash consideration $ 84,000      
Consideration, initial net working capital payment 6,000      
Goodwill 42,000      
Identifiable intangible assets $ 8,900