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Retirement Plan - Assumptions to Calculate Benefit Obligations and Net Periodic Costs of SERP (Detail) - SERP [Member] | 12 Months Ended
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Jun. 25, 2015 | Jun. 26, 2014 | Jun. 27, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Discount rate | 4.63% | 4.37% |
Rate of compensation increases | 4.50% | 4.50% |
Bonus payment | 60% - 85% of base, paid 4 of 5 years | 60% - 85% of base, paid 3 of 5 years |
Discount rate | 4.37% | 4.90% | 4.17%
Rate of compensation increases | 4.50% | 4.50% | 4.50%
Bonus payment | 60% - 85% of base, paid 3 of 5 years | 60% - 70% of base, paid 3 of 5 years | 60% - 70% of base, paid 3 of 5 years

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- Definition Assumed amount and frequency of bonus payment used in calculating benefit obligation of the SERP. + References No definition available. + Details
Name: | jbss_DefinedBenefitPlanDescriptionOfBonusPaymentBenefitObligation
Namespace Prefix: | jbss_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Assumed amount and frequency of bonus payment used in calculating net periodic benefit cost of the SERP. + References No definition available. + Details
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Namespace Prefix: | jbss_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The interest rate used to adjust for the time value of money for the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Expected rate of compensation increases (for pay-related plans). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The interest rate used to adjust for the time value of money. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Expected rate of compensation increases (for pay-related plans). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- 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
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- Details
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