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Subsequent Events (Details)
$ in Thousands
1 Months Ended 2 Months Ended 12 Months Ended
Nov. 15, 2018
USD ($)
Oct. 31, 2018
USD ($)
Nov. 15, 2018
USD ($)
installment
shares
Sep. 30, 2018
USD ($)
shares
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Subsequent Event [Line Items]            
Restructuring and other charges, net       $ (1,003) $ 7,942 $ 76,273
Restricted Stock Units (RSUs) [Member]            
Subsequent Event [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares       2,190,000    
Subsequent Event [Member] | Restricted Stock Units (RSUs) [Member]            
Subsequent Event [Line Items]            
Stock Issued During Period, Value, Restricted Stock Award, Gross     $ 73,500      
Performance-based Award [Member] | Restricted Stock Units (RSUs) [Member]            
Subsequent Event [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares       961,000    
Performance-based Award [Member] | Subsequent Event [Member] | Restricted Stock Units (RSUs) [Member]            
Subsequent Event [Line Items]            
Stock Issued During Period, Value, Restricted Stock Award, Gross     $ 31,900      
Number of Equal Annual Installments | installment     3      
Time-based Award [Member] | Restricted Stock Units (RSUs) [Member]            
Subsequent Event [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares       1,045,000    
Time-based Award [Member] | Subsequent Event [Member] | Restricted Stock Units (RSUs) [Member]            
Subsequent Event [Line Items]            
Stock Issued During Period, Value, Restricted Stock Award, Gross     $ 41,600      
Maximum [Member] | Performance-based Award [Member] | Subsequent Event [Member] | Restricted Stock Units (RSUs) [Member]            
Subsequent Event [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares     146,000      
executive officers [Member] | Performance-based Award [Member] | Subsequent Event [Member] | Restricted Stock Units (RSUs) [Member]            
Subsequent Event [Line Items]            
Stock Issued During Period, Value, Restricted Stock Award, Gross     $ 31,700      
executive officers [Member] | Time-based Award [Member] | Subsequent Event [Member] | Restricted Stock Units (RSUs) [Member]            
Subsequent Event [Line Items]            
Target multiplier (up to)     1      
executive officers [Member] | Maximum [Member] | Time-based Award [Member] | Subsequent Event [Member] | Restricted Stock Units (RSUs) [Member]            
Subsequent Event [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares     197,000      
Chief Executive Officer [Member] | Time-based Award [Member] | Subsequent Event [Member] | Restricted Stock Units (RSUs) [Member]            
Subsequent Event [Line Items]            
Target multiplier (up to)     2      
Line of Credit [Member] | Subsequent Event [Member]            
Subsequent Event [Line Items]            
Proceeds from (Repayments of) Lines of Credit $ 80,000          
Restructuring Plan 2016 [Member] | Subsequent Event [Member]            
Subsequent Event [Line Items]            
Restructuring and other charges, net   $ 18,000