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Quarterly Consolidated Financial Information (unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
May 31, 2020
Feb. 23, 2020
Nov. 24, 2019
Aug. 25, 2019
May 26, 2019
Feb. 24, 2019
Nov. 25, 2018
Aug. 26, 2018
May 31, 2020
May 26, 2019
May 27, 2018
Condensed Financial Information Disclosure [Abstract]                      
Revenues $ 156,131 $ 152,928 $ 142,593 $ 138,714 $ 152,780 $ 155,554 $ 124,557 $ 124,668 $ 590,366 $ 557,559 $ 524,227
Gross profit 24,091 20,047 15,514 15,336 26,212 21,569 16,885 16,337 74,988 81,003 78,338
Net income (loss) from continuing operations (15,149) (11,518) (6,740) (4,784) 367 1,533 (113) 335 (38,191) 2,122 25,761
Net income (loss) applicable to common stockholders $ (15,149) $ (11,518) $ (6,740) $ (4,784) $ (262) $ 1,067 $ (584) $ 190 $ (38,191) $ 411 $ 24,829
Net income per basic share from continuing operations (in dollars per share) $ (0.52) $ (0.39) $ (0.23) $ (0.16) $ 0.01 $ 0.05 $ 0 $ 0.01 $ (1.31) $ 0.07 $ 0.93
Net income per diluted share from continuing operations (in dollars per share) $ (0.52) $ (0.39) $ (0.23) $ (0.16) $ 0.01 $ 0.05 $ 0 $ 0.01 $ (1.31) $ 0.07 $ 0.92