Pension and Postretirement Benefits (Details Textual) - USD ($)	3 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Jul. 01, 2018
Defined Benefit Plan Disclosure [Line Items]
Proposed date the Board of Directors approved to terminate the qualified retirement plan	Dec. 31, 2018
Termination of Qualified Pension Plan, description	The Board of Directors has subsequently approved to proceed with the termination of the Qualified Pension Plan. We submitted a request to, and received a response from, the IRS for a determination letter that the Qualified Pension Plan is qualified for termination. We intend to distribute substantially all of the Qualified Pension Plan assets prior to the end of December 2018. Additionally, in connection with preparing for the termination of the Qualified Pension Plan, we amended the plan to provide that participants are 100 percent vested in their accrued benefits as of the effective date of the plan termination, to adopt a new standard for disability benefits that will apply when the plan’s assets are distributed due to the termination, to add a lump sum distribution for employees and terminated vested participants who are not in payment status when Qualified Pension Plan assets are distributed due to the termination.
Qualified Retirement Plan participants' vesting percentage as of the final termination date of the plan	100.00%
Rabbi Trust Assets - SERP	$ 2,900,000		$ 2,800,000
Postretirement plan annual benefit limit for future eligible retirees	$ 4,000
Other postretirement benefits maximum benefit period	5 years
Contributions to the qualified pension plan	$ 0	$ 0
Expected additional employer contributions during remainder of fiscal 2019	$ 0
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