Debt To Consolidated EBITDA Ratio

No definition available.

Name:	rmd_DebtToConsolidatedEbitdaRatio
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Period Type:	duration

- Definition

Uncommitted option to increase credit facility

+ References

No definition available.

+ Details

Name:	rmd_UncommittedOptionToIncreaseCreditFacility
Namespace Prefix:	rmd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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
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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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
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-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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
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-Subparagraph (SX 210.5-02.22(a)(2))
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+ Details

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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the aggregate of total long-term debt, including current maturities and short-term debt.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtLongtermAndShorttermCombinedAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

Name:	us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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
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-Paragraph 1
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

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Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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-Publisher FASB
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of the required periodic payment applied to principal.

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

Name:	us-gaap_LongTermDebtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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.

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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_CreditFacilityAxis=rmd_RevolvingCreditFacilityAndTermLoanCreditAgreementMember
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Balance Type:
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- Details

Name:	us-gaap_LineOfCreditFacilityAxis=rmd_MufgUnionBankMember
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Balance Type:
Period Type:

- Details

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Balance Type:
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- Details

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- Details

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Balance Type:
Period Type:

- Details

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- Details

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- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
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- Details

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Balance Type:
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Debt (Narrative) (Details) - USD ($)			6 Months Ended
Debt (Narrative) (Details) - USD ($)	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