Consolidated Statements Of Comprehensive Income (Loss) (Parenthetical) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Mar. 28, 2020	Mar. 30, 2019
Statement of Comprehensive Income [Abstract]
Hedge gain (loss) arising during the period, net of tax of $0.2 million in the second quarter of 2020 and 2019, respectively, and $0.9 million and $0.2 million in the first six months of 2020 and 2019, respectively	$ 200,000	$ 200,000	$ 900,000	$ 200,000
Net hedge (gain) loss reclassified into earnings, net of tax of $0.0 million in the second quarter of 2020 and 2019, respectively, and $0.0 million and $0.1 million in the first six months of 2020 and 2019, respectively	0	0	0	100,000
Foreign currency translation adjustment, net of tax of $0 for each period	0	0	0	0
Unrealized gain (loss) on marketable securities, net of tax of $0 for each period	0	0	0	0
Amortization of net actuarial pension loss included in net income, net of tax of $0.3 million and $0.2 million in the second quarter of 2020 and 2019, respectively, and $0.6 million and $0.3 million in the first six months of 2020 and 2019, respectively	$ 300,000	$ 200,000	$ 600,000	$ 300,000