Earning Per Share-Basic (detail) - USD ($) $ / shares in Units, shares in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 31, 2016	Dec. 26, 2015	Dec. 31, 2016
Basic
Net Earnings (Loss)	$ 8,181,000	$ 31,123,000	$ 14,263,000	$ 40,613,000	$ 28,108,000
Deduct preferred stock dividends	6,000	6,000	17,000	17,000
Undistributed Earnings, Basic	8,175,000	31,117,000	14,246,000	40,596,000
Undistributed Earnings Allocated to Participating Securities	75,000	285,000	131,000	416,000
Earnings (Loss) Attributable to Common Stock	$ 8,100,000	$ 30,832,000	$ 14,115,000	$ 40,180,000
Weighted Average Number of Shares Outstanding, Basic	9,770	9,884	9,790	9,891
Basic earnings (loss) per common share	$ 0.83	$ 3.12	$ 1.44	$ 4.06