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Business Combinations - Assets (Details) - USD ($)
Jun. 30, 2018
Sep. 30, 2017
Business Acquisition [Line Items]    
Current assets $ 234,029,000 $ 231,752,000
Property and equipment 25,217,000 24,643,000
Intangible assets (primarily customer relationships) 31,736,000 31,413,000
Goodwill 49,299,000 46,693,000
Current liabilities (143,197,000) $ (150,628,000)
2018 Business Acquisitions [Member]    
Business Acquisition [Line Items]    
Current assets 1,765,000  
Property and equipment 355,000  
Intangible assets (primarily customer relationships) 3,439,000  
Goodwill 2,561,000  
Current liabilities (1,154,000)  
Long term liabilities (14,000)  
Deferred tax liability (773,000)  
Net assets acquired $ 6,179,000