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Income Taxes (Detail Textuals) - USD ($) $ in Thousands			3 Months Ended								12 Months Ended
	Mar. 27, 2020	Dec. 31, 2017	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2020	Mar. 31, 2019
Schedule Of Income Taxes [Line Items]
Income tax benefit			$ 1,746	$ (229)	$ (92)	$ (206)	$ 1,232	$ 376	$ (96)	$ (572)	$ 1,219	$ 940
Federal income tax rate	21.00%	35.00%
Undistributed earnings			$ 144,200								$ 144,200
"CARES Act"
Schedule Of Income Taxes [Line Items]
Decrease in effective tax rate											(54.30%)	20.50%
"CARES Act" | Fiscal Year 2019 Net Operating Losses
Schedule Of Income Taxes [Line Items]
Net operating losses carryback	$ 9,700
Income tax refund	3,500
Income tax benefit	1,400
"CARES Act" | Fiscal Year 2020 Net Operating Losses
Schedule Of Income Taxes [Line Items]
Net operating losses carryback	3,000
Income tax refund	1,000
Income tax benefit	$ 400

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