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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 26, 2020
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On February 22, 2021, the Company announced that intends to issue on or about February 25, 2021 a notice of full redemption to the holders of its 6% Subordinated Debentures due 2027. On January 29, 2021, the Company entered into an asset purchase agreement with Hart & Cooley LLC, whereby the Company purchased the Hart & Cooley flexible duct business. The total purchase price was $14.0 million in cash paid at closing. The acquisition will expand the Company’s footprint in the air quality and climate control systems market and complement the existing flexible duct business within the Climate segment.