Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Jun. 30, 2016
Income Taxes [Line Items]      
Income before income taxes $ 134,299 $ 99,007  
Provision for income taxes $ 29,402 $ 26,774  
Effective tax rate 21.90% 27.00%  
Tax rate comparison, deduction, expiration of statute of limitations $ 8,200    
Tax rate reconciliation, deduction, executive deferred savings plan 3,000    
Decrease in unrecognized tax benefits is reasonably possible $ 19,100    
Forecast      
Income Taxes [Line Items]      
Estimated effective tax rate     22.00%