EARNINGS PER SHARE - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Impairment of goodwill & intangible assets	$ 27,900
Restructuring expenses	$ 23,149
Outstanding stock options with exercise prices exceeding the market price of common stock, excluded from the computation of diluted earnings per share (in shares)	47,223	0	130,704
Offshore and Other Complex Steel Structures
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Valuation allowance	$ 5,076
Valuation allowance (in dollars per share)	$ 0.24
Goodwill And Indefinite-lived Intangible Assets
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Impairment of goodwill & intangible assets	$ 16,220
Impairment of goodwill and intangible assets (in dollars per share)	$ 0.76
long | Offshore and Other Complex Steel Structures
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Impairment of goodwill & intangible assets	$ 21,678
Impairment of goodwill and intangible assets (in dollars per share)	$ 1.01
2020 Restructuring Plan
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Restructuring expenses	$ 17,324
Restructuring expenses, (in dollars per share)	$ 0.81