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Debt (Narrative) (Details) - USD ($) |  |  | 6 Months Ended |
--- | --- | --- | --- | ---
Nov. 05, 2018 | Apr. 17, 2018 | Dec. 31, 2020 | Jun. 30, 2020
Debt Instrument [Line Items] |  |  |  |
Debt to consolidated EBITDA ratio |  |  | 3.50 |
Outstanding debt |  |  | $ 825,720,000 | $ 1,176,120,000
Senior notes, carrying amount |  |  | 500,000,000.0 |
Outstanding loan balance |  |  | 813,732,000 | 1,164,133,000
Revolving Credit Facility And Term Credit Agreement [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, fair value |  |  | 329,000,000.0 | $ 680,000,000.0
MUFG Union Bank [Member] | Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity | $ 1,600,000,000 | $ 800,000,000.0 |  |
Uncommitted option to increase credit facility | $ 300,000,000.0 | 300,000,000.0 |  |
MUFG Union Bank [Member] | ResMed Limited [Member] | Revolving Credit Facility [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 |  | $ 800,000,000.0 |  |
Available for draw |  |  | $ 1,400,000,000 |
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 |  |  | 1.10% |
MUFG Union Bank, N.A. and Westpac Banking Corporation [Member] | ResMed Limited [Member] | Term Credit Agreement [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal payment |  |  | $ 6,000,000.0 |
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% |
Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, fair value |  |  | $ 546,100,000 |
3.24% Senior Notes Due July 10, 2026 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount |  |  | $ 250,000,000.0 |
Interest rate |  |  | 3.24% |
Maturity date |  |  | Jul. 10, 2026 |
3.45% Senior Notes Due July 10, 2029 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount |  |  | $ 250,000,000.0 |
Interest rate |  |  | 3.45% |
Maturity date |  |  | Jul. 10, 2029 |
Revolving Credit Agreement, Term Credit Agreement, And Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding debt |  |  | $ 829,000,000.0 |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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