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Debt - Narrative (Details) - USD ($)
9 Months Ended
Nov. 05, 2018
Apr. 17, 2018
Mar. 31, 2022
Jun. 30, 2021
Jul. 10, 2019
Nov. 04, 2018
Debt Instrument [Line Items]            
Debt to consolidated EBITDA ratio     3.50      
Line of credit facility collateral, maximum percentage of ownership interests held in subsidiary     10.00%      
Senior notes, carrying amount     $ 500,000,000 $ 500,000,000    
Outstanding debt     680,702,000 655,351,000    
3.24% Senior Notes Due July 10, 2026            
Debt Instrument [Line Items]            
Principal amount         $ 250,000,000  
Interest rate         3.24%  
3.45% Senior Notes Due July 10, 2029            
Debt Instrument [Line Items]            
Principal amount         $ 250,000,000  
Interest rate         3.45%  
Senior Notes            
Debt Instrument [Line Items]            
Long-term debt, fair value     495,900,000 530,400,000    
Revolving Credit Agreement, Term Credit Agreement, And Senior Notes            
Debt Instrument [Line Items]            
Outstanding debt     $ 682,000,000      
Revolving Credit Facility And Term Credit Agreement            
Debt Instrument [Line Items]            
Interest rate on outstanding principal amount     1.10%      
Long-term debt, fair value     $ 182,000,000 $ 158,000,000    
Revolving Credit Facility            
Debt Instrument [Line Items]            
Maximum borrowing capacity $ 1,600,000,000 $ 800,000,000       $ 800,000,000
Uncommitted option to increase credit facility $ 300,000,000 300,000,000        
Available for draw     $ 1,600,000,000      
Revolving Credit Facility | ResMed Limited            
Debt Instrument [Line Items]            
Maximum borrowing capacity   $ 200,000,000        
Revolving Credit Facility | Minimum            
Debt Instrument [Line Items]            
Commitment fees percentage rate on unused portion of credit facility     0.10%      
Revolving Credit Facility | Maximum            
Debt Instrument [Line Items]            
Commitment fees percentage rate on unused portion of credit facility     0.175%      
Term Loan Credit Agreement            
Debt Instrument [Line Items]            
Principal payment     $ 6,000,000      
Term Loan Credit Agreement | Minimum | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Credit facility interest rate equal to reference rate plus     0.75%      
Term Loan Credit Agreement | Minimum | Base Rate            
Debt Instrument [Line Items]            
Credit facility interest rate equal to reference rate plus     0.00%      
Term Loan Credit Agreement | Maximum | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Credit facility interest rate equal to reference rate plus     1.50%      
Term Loan Credit Agreement | Maximum | Base Rate            
Debt Instrument [Line Items]            
Credit facility interest rate equal to reference rate plus     0.50%