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Debt (Narrative) (Details) - USD ($) $ in Thousands |  |  |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Apr. 17, 2018 | Jan. 09, 2017 | Apr. 04, 2016 | Oct. 31, 2013 | Sep. 30, 2018 | Jun. 30, 2018
Debt Instrument [Line Items] |  |  |  |  |  |
Outstanding under the revolving credit facility and term credit facility |  |  |  |  | $ 529,612 | $ 281,454
Union Bank, N.A. and HSBC Bank USA [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 1,000,000 | $ 700,000 |  |
Uncommitted option to increase credit facility |  |  | $ 300,000 | $ 300,000 |  |
MUFG Union Bank [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  | $ 1,300,000 |  |  |  |
Uncommitted option to increase credit facility |  | $ 300,000 |  |  |  |
Credit facility termination date |  | Oct. 31, 2018 |  |  |  |
MUFG Union Bank, N.A. and Westpac Banking Corporation [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity | $ 800,000 |  |  |  |  |
Uncommitted option to increase credit facility | 300,000 |  |  |  |  |
MUFG Union Bank, N.A. and Westpac Banking Corporation [Member] | Revolving Credit Facility And Term Credit Agreement [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Credit facility termination date |  |  |  |  | Apr. 17, 2023 |
Interest rate on outstanding principal amount |  |  |  |  | 3.00% |
Outstanding under the revolving credit facility and term credit facility |  |  |  |  | $ 529,600 |
MUFG Union Bank, N.A. and Westpac Banking Corporation [Member] | ResMed Limited [Member] | Term Credit Agreement [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity | $ 200,000 |  |  |  |  |
Principal payment |  |  |  |  | $ 6,000 |
Frequency of payments |  |  |  |  | semi-annual |
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% |
Minimum [Member] | MUFG Union Bank, N.A. and Westpac Banking Corporation [Member] | ResMed Limited [Member] | 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] | MUFG Union Bank, N.A. and Westpac Banking Corporation [Member] | ResMed Limited [Member] | Term Credit Agreement [Member] | Base Rate [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Credit facility interest rate equal to reference rate plus |  |  |  |  | 0.00% |
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% |
Maximum [Member] | MUFG Union Bank, N.A. and Westpac Banking Corporation [Member] | ResMed Limited [Member] | 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] | MUFG Union Bank, N.A. and Westpac Banking Corporation [Member] | ResMed Limited [Member] | Term Credit Agreement [Member] | Base Rate [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Credit facility interest rate equal to reference rate plus |  |  |  |  | 0.50% |

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