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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 - Shareholder's equity, Amount at Sep. 30, 2017 |  |  | $ 492,246 | $ 1,847,819 | $ (739,157) | $ (89,919) | $ (12,474) | $ (335,491) |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares |  |  | (2,733) |  | 5,184 |  |  |  |  |  |  |  |  |  |
Equity-based compensation expense |  |  | 3,500 |  |  |  |  |  |  |  |  |  |  |  |
Adjustment to market - SECT, SERP and other |  |  | (2,958) |  |  |  |  |  |  |  |  |  |  |  |
Net earnings | $ 15,264 |  |  | 15,264 |  |  |  |  |  |  |  |  |  |  |
Dividends |  |  |  | (8,978) |  |  |  |  |  |  |  |  |  |  |
Tax Cuts and Jobs Act, reclassification from AOCIL to retained earnings | (47,077) |  |  | 47,077 |  |  |  | (47,077) |  |  |  |  |  |  |
Class A and B shares purchased |  |  |  |  | (5,118) |  |  |  |  |  |  |  |  |  |
Issuance of shares - SECT |  |  |  |  |  | 1,941 |  |  |  |  |  |  |  |  |
Purchase of shares - SECT | (7,914) |  |  |  |  | (7,914) |  |  |  |  |  |  |  |  |
Adjustment to market |  |  |  |  |  | 2,562 | 396 |  |  |  |  |  |  |  |
Other comprehensive income (loss) | 40,254 |  |  |  |  |  |  | 40,254 |  |  |  |  |  |  |
End of period - Shareholder's equity, Amount at Mar. 31, 2018 | 1,255,704 | $ 51,280 | 490,055 | 1,901,182 | (739,091) | (93,330) | (12,078) | (342,314) |  |  |  |  |  |  |
Beginning of period - Common Stock at Sep. 30, 2017 |  |  |  |  |  |  |  |  | 43,704,286 |  |  | 7,575,427 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Class B to Class A |  |  |  |  |  |  |  |  | 31,272 |  |  | (31,272) |  |  |
End of period - Common Stock at Mar. 31, 2018 |  |  |  |  |  |  |  |  | 43,735,558 |  |  | 7,544,155 |  |  |
Beginning of period, Shares at Sep. 30, 2017 |  |  |  |  |  |  |  |  |  | (10,933,003) |  |  | (3,333,927) | (654,753) |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A and B shares issued related to equity compensation, shares |  |  |  |  |  |  |  |  |  | 79,679 |  |  | 28,239 |  |
Class A and B shares purchased, shares |  |  |  |  |  |  |  |  |  | (37,784) |  |  | (22,165) |  |
Issuance of shares - SECT |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,871 |
Purchase of shares - SECT |  |  |  |  |  |  |  |  |  |  |  |  |  | (91,081) |
End of period, Shares at Mar. 31, 2018 |  |  |  |  |  |  |  |  |  | (10,891,108) | (425,148) |  | (3,327,853) | (723,963) | (150,000)
Beginning of period - Shareholder's equity, Amount at Dec. 30, 2017 |  |  | 498,699 | 1,849,118 | (739,210) | (98,990) | (13,311) | (319,637) |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares |  |  | (1,100) |  | 2,503 |  |  |  |  |  |  |  |  |  |
Equity-based compensation expense |  |  | 1,499 |  |  |  |  |  |  |  |  |  |  |  |
Adjustment to market - SECT, SERP and other |  |  | (9,043) |  |  |  |  |  |  |  |  |  |  |  |
Net earnings | 13,965 |  |  | 13,965 |  |  |  |  |  |  |  |  |  |  |
Dividends |  |  |  | (8,978) |  |  |  |  |  |  |  |  |  |  |
Tax Cuts and Jobs Act, reclassification from AOCIL to retained earnings | (47,077) |  |  | 47,077 |  |  |  | (47,077) |  |  |  |  |  |  |
Class A and B shares purchased |  |  |  |  | (2,384) |  |  |  |  |  |  |  |  |  |
Issuance of shares - SECT |  |  |  |  |  | 1,941 |  |  |  |  |  |  |  |  |
Purchase of shares - SECT |  |  |  |  |  | (4,091) |  |  |  |  |  |  |  |  |
Adjustment to market |  |  |  |  |  | 7,810 | 1,233 |  |  |  |  |  |  |  |
Other comprehensive income (loss) | 24,400 |  |  |  |  |  |  | 24,400 |  |  |  |  |  |  |
End of period - Shareholder's equity, Amount at Mar. 31, 2018 | 1,255,704 | 51,280 | 490,055 | 1,901,182 | (739,091) | (93,330) | (12,078) | (342,314) |  |  |  |  |  |  |
Beginning of period - Common Stock at Dec. 30, 2017 |  |  |  |  |  |  |  |  | 43,715,586 |  |  | 7,564,127 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Class B to Class A |  |  |  |  |  |  |  |  | 19,972 |  |  | (19,972) |  |  |
End of period - Common Stock at Mar. 31, 2018 |  |  |  |  |  |  |  |  | 43,735,558 |  |  | 7,544,155 |  |  |
Beginning of period, Shares at Dec. 30, 2017 |  |  |  |  |  |  |  |  |  | (10,901,537) |  |  | (3,328,064) | (699,415) |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A and B shares issued related to equity compensation, shares |  |  |  |  |  |  |  |  |  | 15,193 |  |  | 22,361 |  |
Class A and B shares purchased, shares |  |  |  |  |  |  |  |  |  | (4,764) |  |  | (22,150) |  |
Issuance of shares - SECT |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,871 |
Purchase of shares - SECT |  |  |  |  |  |  |  |  |  |  |  |  |  | (46,419) |
End of period, Shares at Mar. 31, 2018 |  |  |  |  |  |  |  |  |  | (10,891,108) | (425,148) |  | (3,327,853) | (723,963) | (150,000)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adoption of revenue recognition standard | ASC 606 |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Beginning of period - Shareholder's equity, Amount at Sep. 29, 2018 | 1,224,986 |  | 502,257 | 1,973,514 | (738,494) | (118,449) | (72,941) | (372,181) |  |  |  |  |  |  |
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 | 86,428 |  |  | 86,428 |  |  |  |  |  |  |  |  |  |  |
Dividends |  |  |  | (17,430) |  |  |  |  |  |  |  |  |  |  |
Tax Cuts and Jobs Act, reclassification from AOCIL to retained earnings | 0 |  |  | 0 |  |  |  | 0 |  |  |  |  |  |  |
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) | 1,800 |  |  |  |  |  |  | 1,800 |  |  |  |  |  |  |
End of period - Shareholder's equity, Amount at Mar. 30, 2019 | 1,314,442 | 51,280 | 510,538 | 2,057,435 | (749,845) | (109,506) | (75,079) | (370,381) |  |  |  |  |  |  |
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) |  |  | 3,323,996 | (983,772) |
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)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adoption of revenue recognition standard | ASC 606 |  |  |  | 14,923 |  |  |  |  |  |  |  |  |  |  |
Beginning of period - Shareholder's equity, Amount at Dec. 29, 2018 |  |  | 491,945 | 2,023,803 | (747,900) | (102,182) | (67,597) | (376,085) |  |  |  |  |  |  |
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 | 42,359 |  |  | 42,359 |  |  |  |  |  |  |  |  |  |  |
Dividends |  |  |  | (8,727) |  |  |  |  |  |  |  |  |  |  |
Tax Cuts and Jobs Act, reclassification from AOCIL to retained earnings | 0 |  |  | 0 |  |  |  | 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) | 5,704 |  |  |  |  |  |  | 5,704 |  |  |  |  |  |  |
End of period - Shareholder's equity, Amount at Mar. 30, 2019 | $ 1,314,442 | $ 51,280 | $ 510,538 | 2,057,435 | $ (749,845) | $ (109,506) | $ (75,079) | $ (370,381) |  |  |  |  |  |  |
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) |  |  | (3,348,499) | (899,864) |
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)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adoption of revenue recognition standard | ASC 606 |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |

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