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Debt (Narrative) (Details) - USD ($) |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
Nov. 05, 2018 | Apr. 17, 2018 | Mar. 31, 2020 | Jun. 30, 2019
Debt Instrument [Line Items] |  |  |  |
Debt to consolidated EBITDA ratio |  |  | 3.50 |
Outstanding under the revolving credit facility and term credit facility |  |  | $ 1,376,836,000 | $ 1,270,853,000
Senior notes, carrying amount |  |  | 500,000,000.0 |
Revolving Credit Facility And Term Credit Agreement [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, fair value |  |  | 881,000,000.0 | $ 1,274,000,000.0
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 |  |  | $ 895,000,000.0 |
MUFG Union Bank, N.A. and Westpac Banking Corporation [Member] | Revolving Credit Facility And Term Credit Agreement [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit facility termination date |  |  | Apr. 17, 2023 |
Interest rate on outstanding principal amount |  |  | 1.90% |
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 |  |  | $ 521,100,000 |
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 |

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 Reference 2: 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=114775744&loc=d3e28551-108399 Reference 3: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 2: 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=6876686&loc=d3e534808-122878 + Details
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