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Debt - Senior Unsecured Notes- Additional Information (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Feb. 13, 2020
May 31, 2016
Mar. 28, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Debt Instrument [Line Items]            
Repayments of lines of credit       $ 610,125 $ 180,000 $ 320,000
Line of Credit            
Debt Instrument [Line Items]            
Repayments of lines of credit     $ 460,000      
Redemption price, percentage 101.00%          
4.000% Senior Notes Due 2028            
Debt Instrument [Line Items]            
Senior Notes $ 500,000          
Interest rate 4.00%          
4.000% Senior Notes Due 2028 | Senior Notes            
Debt Instrument [Line Items]            
Fair value amount       515,100    
3.625% Senior Notes Due 2025            
Debt Instrument [Line Items]            
Senior Notes $ 500,000          
Interest rate 3.625%          
3.625% Senior Notes Due 2025 | Senior Notes            
Debt Instrument [Line Items]            
Fair value amount       $ 507,500    
6.000% Senior Notes Due 2024            
Debt Instrument [Line Items]            
Interest rate   6.00%        
6.000% Senior Notes Due 2024 | Q3 2020            
Debt Instrument [Line Items]            
Senior Notes   $ 500,000        
Redemption price, percentage   103.00%