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INCOME TAXES (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2016
Income Tax Contingency [Line Items]      
Income tax expense $ 23,336 $ 19,040  
Effective tax rate (percent) 28.70% 26.70%  
Deferred tax asset $ 419,800   $ 422,800
Deferred tax assets 422,410   422,849
Offsetting deferred tax liabilities 2,600    
Decrease in deferred tax assets 3,000    
Increase in deferred tax assets resulting from ordinary business     2,600
Increase in deferred tax assets in connection with Exchange Agreement 16,800    
Tax receivable agreement liabilities $ 284,200   $ 279,700
Tax receivable agreement, percentage recorded as liabilities 85.00%    
Increase in tax receivable agreement liabilities $ 4,500    
Increase in TRA liabilities in connection with quarterly member owner exchanges 10,200    
Adjustment to tax receivable agreement liability 5,722 $ 4,818  
Premier Healthcare Solutions, Inc.      
Income Tax Contingency [Line Items]      
Increase in deferred tax assets valuation allowance 5,100    
State and Local Jurisdiction      
Income Tax Contingency [Line Items]      
Reduction in deferred tax assets related to state income tax rate reduction 9,300    
FFF Enterprises, Inc.      
Income Tax Contingency [Line Items]      
Decrease in deferred tax assets $ 2,800