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Note 4 - Goodwill and Other Intangible Assets - Changes in the Carrying Amount of Goodwill (Details) - USD ($)
3 Months Ended
Mar. 16, 2020
Dec. 27, 2020
Goodwill, gross amount   $ 1,617,174,000
Accumulated impairment losses   (1,288,729,000)
Goodwill, beginning of period   328,445,000
Measurement period adjustments $ 78,539,000 403,000
Goodwill, end of period   $ 328,848,000