Retirement Plans and Postretirement Costs - Summary of Pension Supplemental Executive Retirement Plan and Postretirement Plans Income and Expense (Details) - USD ($)	12 Months Ended
	Jun. 28, 2020	Jun. 30, 2019
COMPONENTS OF NET PERIODIC BENEFIT COST:
Plan settlements		$ 31,878,000
CHANGE IN PLAN ASSETS:
Fair value of plan assets at end of year	$ 0
CHANGES IN PLAN ASSETS AND BENEFIT OBLIGATIONS RECOGNIZED IN OTHER COMPREHENSIVE INCOME:
Amortization of prior service credits	29,000	439,000
Amortization of unrecognized net loss	(412,000)	(1,262,000)
Pension and SERP Benefits
COMPONENTS OF NET PERIODIC BENEFIT COST:
Service cost	74,000	62,000
Interest cost	61,000	2,101,000
Expected return on plan assets		(2,275,000)
Plan settlements		31,878,000
Amortization of unrecognized net loss	15,000	831,000
Net periodic benefit cost (credit)	$ 150,000	$ 32,597,000
Benefit Obligations:
Benefit Obligations, Discount rate	2.33%	3.17%
Benefit Obligations, Rate of compensation increases - SERP	3.00%	3.00%
Net Periodic Benefit Cost:
Net Periodic Benefit Cost, Discount rate	3.17%	4.30%
Net Periodic Benefit Cost, Rate of compensation increases - SERP	3.00%	3.00%
CHANGE IN PROJECTED BENEFIT OBLIGATION:
Benefit obligation at beginning of year	$ 2,229,000	$ 98,835,000
Service cost	74,000	62,000
Interest cost	61,000	2,101,000
Plan settlements		(72,400,000)
Actuarial gain	3,000	5,143,000
Benefits paid	(74,000)	(31,512,000)
Benefit obligation at end of year	2,293,000	2,229,000
CHANGE IN PLAN ASSETS:
Fair value of plan assets at beginning of year	8,645,000	111,466,000
Actual return on plan assets	84,000	1,077,000
Employer contribution	14,000	14,000
Excess Asset Transfer	(9,019,000)
Plan settlements	350,000	(72,400,000)
Benefits paid	(74,000)	(31,512,000)
Fair value of plan assets at end of year		8,645,000
Funded status – (accrued) prepaid benefit obligations	(2,293,000)	6,416,000
AMOUNTS RECOGNIZED IN CONSOLIDATED BALANCE SHEETS:
Other long-term assets		8,585,000
Accrued payroll and benefits (current liabilities)	(1,039,000)	(506,000)
Accrued benefit obligations (long-term liabilities)	(1,254,000)	(1,663,000)
Net amount recognized	(2,293,000)	6,416,000
CHANGES IN PLAN ASSETS AND BENEFIT OBLIGATIONS RECOGNIZED IN OTHER COMPREHENSIVE INCOME:
Net periodic benefit cost	150,000	32,597,000
Net actuarial loss (gain)	3,000	(57,414,000)
Plan settlements		31,878,000
Amortization of unrecognized net loss	(15,000)	(831,000)
Total recognized in other comprehensive (income) loss, before tax	(12,000)	(26,367,000)
Total recognized in net periodic benefit cost and other comprehensive loss, before tax	138,000	6,230,000
Postretirement Benefits
COMPONENTS OF NET PERIODIC BENEFIT COST:
Service cost	12,000	11,000
Interest cost	26,000	40,000
Amortization of prior service cost (credit)	(29,000)	(439,000)
Amortization of unrecognized net loss	397,000	431,000
Net periodic benefit cost (credit)	$ 406,000	$ 43,000
Benefit Obligations:
Benefit Obligations, Discount rate	2.07%	3.01%
Net Periodic Benefit Cost:
Net Periodic Benefit Cost, Discount rate	3.01%	4.30%
CHANGE IN PROJECTED BENEFIT OBLIGATION:
Benefit obligation at beginning of year	$ 914,000	$ 1,041,000
Service cost	12,000	11,000
Interest cost	26,000	40,000
Actuarial gain	22,000	39,000
Benefits paid	(153,000)	(217,000)
Benefit obligation at end of year	821,000	914,000
CHANGE IN PLAN ASSETS:
Employer contribution	153,000	217,000
Benefits paid	(153,000)	(217,000)
Funded status – (accrued) prepaid benefit obligations	(821,000)	(914,000)
AMOUNTS RECOGNIZED IN CONSOLIDATED BALANCE SHEETS:
Accrued payroll and benefits (current liabilities)	(120,000)	(152,000)
Accrued benefit obligations (long-term liabilities)	(701,000)	(762,000)
Net amount recognized	(821,000)	(914,000)
CHANGES IN PLAN ASSETS AND BENEFIT OBLIGATIONS RECOGNIZED IN OTHER COMPREHENSIVE INCOME:
Net periodic benefit cost	406,000	43,000
Net actuarial loss (gain)	22,000	39,000
Amortization of prior service credits	29,000	439,000
Amortization of unrecognized net loss	(397,000)	(431,000)
Total recognized in other comprehensive (income) loss, before tax	(346,000)	47,000
Total recognized in net periodic benefit cost and other comprehensive loss, before tax	$ 60,000	$ 90,000