Derivative Financial Instruments - Location of Gain (Loss) on Derivatives (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Mar. 28, 2020	Mar. 30, 2019	Mar. 28, 2020	Mar. 30, 2019
Derivative [Line Items]
Interest expense	$ 83,854	$ 94,514	$ 243,951	$ 270,643
Unrealized gain (loss) on hedged item in fair value hedge, interest expense	(14,562)	(17,051)	(43,679)	(47,834)
Unrealized gain (loss) on hedged item in fair value hedge, change in fair value of debt	38,380	24,606	39,348	49,330
Hedging Instrument \| Fair Value Hedging \| Interest rate swaps \| Interest expense
Derivative [Line Items]
Gain (loss) on fair value hedging relationship, hedged items	(52,942)	(41,657)	(83,027)	(97,164)
Gain (loss) on fair value hedging relationship, designated as hedging instruments	$ 38,923	$ 18,865	$ 38,532	$ 39,556

Change In Unrealized Gain (Loss) On Hedged Item In Fair Value Hedge, Change In Fair Value Of Debt

No definition available.

Name:	syy_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedgeChangeInFairValueOfDebt
Namespace Prefix:	syy_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Change In Unrealized Gain (Loss) On Hedged Item In Fair Value Hedge, Interest Expense

+ References

No definition available.

+ Details

Name:	syy_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedgeInterestExpense
Namespace Prefix:	syy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=109977999&loc=d3e76258-113986

+ Details

Name:	us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

+ References

+ Details

Name:	us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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

- Definition

The net amount of operating interest income (expense).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.10)
-URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260

+ Details

Name:	us-gaap_InterestIncomeExpenseNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_HedgingDesignationAxis=us-gaap_DesignatedAsHedgingInstrumentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_FairValueHedgingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_InterestExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: