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Consolidated Condensed Statements of Shareholders' Equity Statement - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Retained Earnings | Treasury Stock At Cost | Stock Employee Compensation Trust (SECT) | Supplemental Retirement Plan (SERP) Trust | Accumulated Other Comprehensive Loss | Class A Common Stock | Class A Common Stock Treasury Stock At Cost | Class A Common Stock Stock Employee Compensation Trust (SECT) | Class B Common Stock | Class B Common Stock Treasury Stock At Cost | Class B Common Stock Stock Employee Compensation Trust (SECT) | Class B Common Stock Supplemental Retirement Plan (SERP) Trust
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Beginning of period at Sep. 29, 2018 |  | $ 51,280 | $ 502,257 | $ 1,974,125 | $ (738,494) | $ (118,449) | $ (72,941) | $ (372,792) |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares |  |  | 1,070 |  | 4,968 |  |  |  |  |  |  |  |  |  |
Equity-based compensation expense |  |  | 3,691 |  |  |  |  |  |  |  |  |  |  |  |
Adjustment to market - SECT, SERP and other |  |  | 3,520 |  |  |  |  |  |  |  |  |  |  |  |
Net earnings | $ 83,828 |  |  | 83,828 |  |  |  |  |  |  |  |  |  |  |
Dividends |  |  |  | (17,430) |  |  |  |  |  |  |  |  |  |  |
Adoption of ASC 606 | ASC 606 |  |  |  | 14,923 |  |  |  |  |  |  |  |  |  |  |
Class A and B shares purchased |  |  |  |  | (16,319) |  |  |  |  |  |  |  |  |  |
Issuance of shares - SECT |  |  |  |  |  | 17,679 |  |  |  |  |  |  |  |  |
Purchase of shares - SECT | (7,354) |  |  |  |  | (7,354) |  |  |  |  |  |  |  |  |
Adjustment to market |  |  |  |  |  | (1,382) | (2,138) |  |  |  |  |  |  |  |
Other comprehensive income (loss) | 4,400 |  |  |  |  |  |  | 4,400 |  |  |  |  |  |  |
End of period at Mar. 30, 2019 | 1,314,442 | 51,280 | 510,538 | 2,055,446 | (749,845) | (109,506) | (75,079) | (368,392) |  |  |  |  |  |  |
Beginning of period - Common Stock at Sep. 29, 2018 |  |  |  |  |  |  |  |  | 43,784,489 |  |  | 7,495,224 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Class B to Class A |  |  |  |  |  |  |  |  | 946 |  |  | (946) |  |  |
End of period - Common Stock at Mar. 30, 2019 |  |  |  |  |  |  |  |  | 43,785,435 |  |  | 7,494,278 |  |  |
Beginning of period, Shares at Sep. 29, 2018 |  |  |  |  |  |  |  |  |  | (10,872,575) | (425,148) |  | (3,323,996) | (983,772) | (876,170)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A and B shares issued related to equity compensation, shares |  |  |  |  |  |  |  |  |  | 71,863 |  |  | 98,329 |  |
Class A and B shares purchased, shares |  |  |  |  |  |  |  |  |  | (82,068) |  |  | (121,583) |  |
Issuance of shares - SECT |  |  |  |  |  |  |  |  |  |  |  |  |  | 221,326 |
Purchase of shares - SECT |  |  |  |  |  |  |  |  |  |  |  |  |  | (84,081) |
End of period, Shares at Mar. 30, 2019 |  |  |  |  |  |  |  |  |  | (10,882,780) | (425,148) |  | (3,347,250) | (846,527) | (876,170)
Beginning of period at Dec. 29, 2018 |  | 51,280 | 491,945 | 2,023,114 | (747,900) | (102,182) | (67,597) | (375,396) |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares |  |  | (1,390) |  | 3,833 |  |  |  |  |  |  |  |  |  |
Equity-based compensation expense |  |  | 1,683 |  |  |  |  |  |  |  |  |  |  |  |
Adjustment to market - SECT, SERP and other |  |  | 18,300 |  |  |  |  |  |  |  |  |  |  |  |
Net earnings | 41,059 |  |  | 41,059 |  |  |  |  |  |  |  |  |  |  |
Dividends |  |  |  | (8,727) |  |  |  |  |  |  |  |  |  |  |
Adoption of ASC 606 | ASC 606 |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Class A and B shares purchased |  |  |  |  | (5,778) |  |  |  |  |  |  |  |  |  |
Issuance of shares - SECT |  |  |  |  |  | 8,918 |  |  |  |  |  |  |  |  |
Purchase of shares - SECT |  |  |  |  |  | (5,424) |  |  |  |  |  |  |  |  |
Adjustment to market |  |  |  |  |  | (10,818) | (7,482) |  |  |  |  |  |  |  |
Other comprehensive income (loss) | 7,004 |  |  |  |  |  |  | 7,004 |  |  |  |  |  |  |
End of period at Mar. 30, 2019 | 1,314,442 | 51,280 | 510,538 | 2,055,446 | (749,845) | (109,506) | (75,079) | (368,392) |  |  |  |  |  |  |
Beginning of period - Common Stock at Dec. 29, 2018 |  |  |  |  |  |  |  |  | 43,785,435 |  |  | 7,494,278 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Class B to Class A |  |  |  |  |  |  |  |  | 0 |  |  | 0 |  |  |
End of period - Common Stock at Mar. 30, 2019 |  |  |  |  |  |  |  |  | 43,785,435 |  |  | 7,494,278 |  |  |
Beginning of period, Shares at Dec. 29, 2018 |  |  |  |  |  |  |  |  |  | (10,897,407) | (425,148) |  | (3,348,499) | (899,864) | (876,170)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A and B shares issued related to equity compensation, shares |  |  |  |  |  |  |  |  |  | 48,122 |  |  | 39,536 |  |
Class A and B shares purchased, shares |  |  |  |  |  |  |  |  |  | (33,495) |  |  | (38,287) |  |
Issuance of shares - SECT |  |  |  |  |  |  |  |  |  |  |  |  |  | 113,749 |
Purchase of shares - SECT |  |  |  |  |  |  |  |  |  |  |  |  |  | (60,412) |
End of period, Shares at Mar. 30, 2019 |  |  |  |  |  |  |  |  |  | (10,882,780) | (425,148) |  | (3,347,250) | (846,527) | (876,170)
Beginning of period at Sep. 28, 2019 | 1,322,481 | 51,280 | 510,546 | 2,128,739 | (769,569) | (111,492) | (71,546) | (415,477) |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares |  |  | 3,767 |  | 4,448 |  |  |  |  |  |  |  |  |  |
Equity-based compensation expense |  |  | 3,271 |  |  |  |  |  |  |  |  |  |  |  |
Adjustment to market - SECT, SERP and other |  |  | (67,864) |  |  |  |  |  |  |  |  |  |  |  |
Net earnings | 99,772 |  |  | 99,772 |  |  |  |  |  |  |  |  |  |  |
Dividends |  |  |  | (17,049) |  |  |  |  |  |  |  |  |  |  |
Adoption of ASC 606 | ASC 606 |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Class A and B shares purchased |  |  |  |  | (191,961) |  |  |  |  |  |  |  |  |  |
Issuance of shares - SECT |  |  |  |  |  | 18,325 |  |  |  |  |  |  |  |  |
Purchase of shares - SECT | (6,209) |  |  |  |  | (6,209) |  |  |  |  |  |  |  |  |
Adjustment to market |  |  |  |  |  | 38,990 | 28,874 |  |  |  |  |  |  |  |
Other comprehensive income (loss) | 8,833 |  |  |  |  |  |  | 8,833 |  |  |  |  |  |  |
End of period at Mar. 28, 2020 | 1,245,678 | 51,280 | 449,720 | 2,211,462 | (957,082) | (60,386) | (42,672) | (406,644) |  |  |  |  |  |  |
Beginning of period - Common Stock at Sep. 28, 2019 |  |  |  |  |  |  |  |  | 43,794,935 |  |  | 7,484,778 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Class B to Class A |  |  |  |  |  |  |  |  | 4,294 |  |  | (4,294) |  |  |
End of period - Common Stock at Mar. 28, 2020 |  |  |  |  |  |  |  |  | 43,799,229 |  |  | 7,480,484 |  |  |
Beginning of period, Shares at Sep. 28, 2019 |  |  |  |  |  |  |  |  |  | (11,101,512) | (425,148) |  | (3,345,489) | (886,300) | (826,170)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A and B shares issued related to equity compensation, shares |  |  |  |  |  |  |  |  |  | 17,599 |  |  | 138,784 |  |
Class A and B shares purchased, shares |  |  |  |  |  |  |  |  |  | (2,286,697) |  |  | (138,172) |  |
Issuance of shares - SECT |  |  |  |  |  |  |  |  |  |  |  |  |  | 221,256 |
Purchase of shares - SECT |  |  |  |  |  |  |  |  |  |  |  |  |  | (69,562) |
End of period, Shares at Mar. 28, 2020 |  |  |  |  |  |  |  |  |  | (13,370,610) | (425,148) |  | (3,344,877) | (734,606) | (826,170)
Beginning of period at Dec. 28, 2019 |  | 51,280 | 518,822 | 2,170,105 | (828,453) | (115,503) | (71,381) | (388,179) |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares |  |  | (722) |  | 3,921 |  |  |  |  |  |  |  |  |  |
Equity-based compensation expense |  |  | 890 |  |  |  |  |  |  |  |  |  |  |  |
Adjustment to market - SECT, SERP and other |  |  | (69,270) |  |  |  |  |  |  |  |  |  |  |  |
Net earnings | 49,745 |  |  | 49,745 |  |  |  |  |  |  |  |  |  |  |
Dividends |  |  |  | (8,388) |  |  |  |  |  |  |  |  |  |  |
Adoption of ASC 606 | ASC 606 |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Class A and B shares purchased |  |  |  |  | (132,550) |  |  |  |  |  |  |  |  |  |
Issuance of shares - SECT |  |  |  |  |  | 18,325 |  |  |  |  |  |  |  |  |
Purchase of shares - SECT |  |  |  |  |  | (3,769) |  |  |  |  |  |  |  |  |
Adjustment to market |  |  |  |  |  | 40,561 | 28,709 |  |  |  |  |  |  |  |
Other comprehensive income (loss) | (18,465) |  |  |  |  |  |  | (18,465) |  |  |  |  |  |  |
End of period at Mar. 28, 2020 | $ 1,245,678 | $ 51,280 | $ 449,720 | $ 2,211,462 | $ (957,082) | $ (60,386) | $ (42,672) | $ (406,644) |  |  |  |  |  |  |
Beginning of period - Common Stock at Dec. 28, 2019 |  |  |  |  |  |  |  |  | 43,796,335 |  |  | 7,483,378 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Class B to Class A |  |  |  |  |  |  |  |  | 2,894 |  |  | (2,894) |  |  |
End of period - Common Stock at Mar. 28, 2020 |  |  |  |  |  |  |  |  | 43,799,229 |  |  | 7,480,484 |  |  |
Beginning of period, Shares at Dec. 28, 2019 |  |  |  |  |  |  |  |  |  | (11,767,540) | (425,148) |  | (3,260,602) | (914,896) | (826,170)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A and B shares issued related to equity compensation, shares |  |  |  |  |  |  |  |  |  | 14,521 |  |  | 44,217 |  |
Class A and B shares purchased, shares |  |  |  |  |  |  |  |  |  | (1,617,591) |  |  | (128,492) |  |
Issuance of shares - SECT |  |  |  |  |  |  |  |  |  |  |  |  |  | 221,256 |
Purchase of shares - SECT |  |  |  |  |  |  |  |  |  |  |  |  |  | (40,966) |
End of period, Shares at Mar. 28, 2020 |  |  |  |  |  |  |  |  |  | (13,370,610) | (425,148) |  | (3,344,877) | (734,606) | (826,170)

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