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Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2019
Apr. 30, 2018
Jul. 31, 2018
Finite-Lived Intangible Assets [Line Items]          
Amortization of Intangible Assets $ 2,500 $ 3,600 $ 8,000 $ 10,900  
Amortized intangibles:          
Accumulated amortization (22,698)   (22,698)   $ (42,025)
Net intangibles 57,627   57,627   64,892
Intangible Assets, Explanation of Significant Deletions     28,000    
Supply contracts & customer relationships          
Amortized intangibles:          
Gross carrying amount 49,103   49,103   71,787
Trade name          
Amortized intangibles:          
Gross carrying amount 23,529   23,529   24,173
Licenses and databases          
Amortized intangibles:          
Gross carrying amount 7,693   7,693   9,291
Covenants not to compete          
Amortized intangibles:          
Gross carrying amount $ 0   $ 0   $ 1,666