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Retirement Plan - Assumptions to Calculate Benefit Obligation and Net Periodic Costs of SERP (Detail) - SERP [Member]
 12 Months Ended
Jun. 29, 2017
Jun. 30, 2016
Jun. 25, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Discount rate 3.99% 3.61%  
Rate of compensation increases 4.50% 4.50%  
Bonus payment 60% - 85% of base, paid 4 of 5 years 60% - 85% of base, paid 4 of 5 years  
Discount rate 3.61% 4.63% 4.37%
Rate of compensation increases 4.50% 4.50% 4.50%
Mortality RP-2014 white collar with MP- 2015 scale RP-2014 white collar with MP- 2014 scale IRS 2014 (Unisex)
Bonus payment 60% -85% of base, paid 4 of 5 years 60% -85% of base, paid 4 of 5 years 60% - 85% of base, paid 3 of 5 years