Uncommitted option to increase credit facility

No definition available.

Name:	rmd_UncommittedOptionToIncreaseCreditFacility
Namespace Prefix:	rmd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

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

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
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

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

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

+ 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

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
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.

+ References

+ Details

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

- Definition

Amount of the required periodic payment applied to principal.

+ References

+ Details

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

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=rmd_MufgUnionBankNaAndWestpacBankingCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=rmd_RevolvingCreditFacilityAndTermLoanCreditAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=rmd_FirstAmendmentToAmendedAndRestatedCreditAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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- Details

Name:	us-gaap_CreditFacilityAxis=rmd_TermLoanCreditAgreementMember
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Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
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- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
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Data Type:	na
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Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
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Data Type:	na
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- Details

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Debt (Narrative) (Details) - USD ($) $ in Thousands			6 Months Ended
Debt (Narrative) (Details) - USD ($) $ in Thousands	Nov. 05, 2018	Apr. 17, 2018	Dec. 31, 2018	Jun. 30, 2018
Debt Instrument [Line Items]
Outstanding under the revolving credit facility and term credit facility			$ 1,197,478	$ 281,454
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			3.30%
Outstanding under the revolving credit facility and term credit facility			$ 1,197,500
MUFG Union Bank, N.A. and Westpac Banking Corporation [Member] \| First Amendment To Amended And Restated Credit Agreement [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 1,600,000
Uncommitted option to increase credit facility	$ 300,000
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
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%