Pension and Postretirement Benefits (Details Textual) - USD ($)	3 Months Ended		12 Months Ended
	Sep. 27, 2020	Sep. 29, 2019	Jun. 28, 2020	Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Date the Board of Directors freeze benefit accruals and future eligibility under the Qualified Pension Plan	Dec. 31, 2009
Termination of Qualified Pension Plan, description	The Board of Directors subsequently approved to proceed with the termination of the Qualified Pension Plan. During the quarter ended December 30, 2018, we completed a substantial portion of terminating the Qualified Pension Plan. In connection with the termination of the Qualified Pension Plan, distributions from the Qualified Pension Plan trust were made during the three month period ended December 30, 2018 to participants who elected lump-sum distributions. Additionally, during the three months ended December 30, 2018, we entered into an agreement with an insurance company to purchase from us, through a series of annuity contracts, our remaining obligations under the Qualified Pension Plan and, as a result, we settled the remaining obligations under the plan for the remaining participants utilizing funds available in the Qualified Pension Plan trust.
Additional cash contributions to settle pension obligations	$ 0
Non-cash pre-tax settlement charge				$ 31,900,000
Non-cash compensation expense		$ 2,228,000	$ 4,800,000	$ 4,200,000
Rabbi Trust Assets - SERP	2,900,000		$ 2,900,000
Postretirement plan annual benefit limit for future eligible retirees	$ 4,000
Other postretirement benefits maximum benefit period	5 years
Supplemental Employee Retirement Plan, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Percentage of participant's base salary received as Supplemental Retirement Benefits	8.00%
Vesting period, SERP	5 years