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Debt (Narrative) (Details) - USD ($)
12 Months Ended
Nov. 05, 2018
Apr. 17, 2018
Jun. 30, 2021
Jun. 30, 2020
Jul. 10, 2019
Nov. 04, 2018
Debt Instrument [Line Items]            
Debt to consolidated EBITDA ratio     3.50      
Outstanding debt     $ 655,351,000 $ 1,176,120,000    
Outstanding loan balance     643,351,000 1,164,133,000    
Revolving Credit Facility And Term Credit Agreement [Member]            
Debt Instrument [Line Items]            
Available for draw     1,600,000,000      
Principal payment     6,000,000.0      
Long-term debt, fair value     $ 158,000,000.0 $ 680,000,000.0    
MUFG Union Bank [Member] | ResMed Limited [Member] | Revolving Credit Facility And Term Credit Agreement [Member]            
Debt Instrument [Line Items]            
Maximum borrowing capacity   $ 200,000,000.0        
MUFG Union Bank, N.A. and Westpac Banking Corporation [Member] | Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Maximum borrowing capacity $ 1,600,000,000 800,000,000.0       $ 800,000,000.0
Uncommitted option to increase credit facility $ 300,000,000.0 $ 300,000,000.0        
MUFG Union Bank, N.A. and Westpac Banking Corporation [Member] | Revolving Credit Facility And Term Credit Agreement [Member]            
Debt Instrument [Line Items]            
Interest rate on outstanding principal amount     0.90%      
Minimum [Member] | Revolving Credit Facility And Term Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument [Line Items]            
Credit facility interest rate equal to reference rate plus     0.75%      
Minimum [Member] | Revolving Credit Facility And Term Credit Agreement [Member] | Base Rate [Member]            
Debt Instrument [Line Items]            
Credit facility interest rate equal to reference rate plus     0.00%      
Minimum [Member] | MUFG Union Bank, N.A. and Westpac Banking Corporation [Member] | Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Commitment fees percentage rate on unused portion of credit facility     0.10%      
Maximum [Member] | Revolving Credit Facility And Term Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument [Line Items]            
Credit facility interest rate equal to reference rate plus     1.50%      
Maximum [Member] | Revolving Credit Facility And Term Credit Agreement [Member] | Base Rate [Member]            
Debt Instrument [Line Items]            
Credit facility interest rate equal to reference rate plus     0.50%      
Maximum [Member] | MUFG Union Bank, N.A. and Westpac Banking Corporation [Member] | Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Commitment fees percentage rate on unused portion of credit facility     0.175%      
Senior Notes [Member]            
Debt Instrument [Line Items]            
Outstanding loan balance     $ 500,000,000.0      
Long-term debt, fair value     $ 530,400,000      
3.24% Senior Notes Due July 10, 2026 [Member]            
Debt Instrument [Line Items]            
Principal amount         $ 250,000,000.0  
Interest rate     3.24%      
3.45% Senior Notes Due July 10, 2029 [Member]            
Debt Instrument [Line Items]            
Principal amount         $ 250,000,000.0  
Interest rate     3.45%      
Revolving Credit Agreement, Term Credit Agreement, And Senior Notes [Member]            
Debt Instrument [Line Items]            
Outstanding debt     $ 658,000,000.0