Retirement Plans	12 Months Ended
Dec. 31, 2016
Retirement Plans Disclosure [Abstract]
Retirement Plans	(5) Retirement Plans The Company has a trusteed, noncontributory ESOP for the benefit of eligible employees. The Company recognizes an expense related to the Company’s discretionary contribution to the ESOP based on a percent of net earnings before taxes that is approved by the Board of Directors each year. ESOP contributions can be made in Company common stock or cash. Compensation expense recorded for contributions to this plan was $334,422,000, $337,703,000 and $310,050,000 for 2016, 2015 and 2014, respectively. Since the Company’s common stock is not traded on an established securities market, the ESOP includes a put option for shares of the Company’s common stock distributed from the ESOP. Shares are distributed from the ESOP primarily to separated vested participants and certain eligible participants who elect to diversify their account balances. Under the Company’s administration of the ESOP’s put option, if the owners of distributed shares desire to sell their shares, the Company is required to purchase the shares at fair value for a specified time period after distribution of the shares from the ESOP. The fair value of distributed shares subject to the put option totaled $425,514,000 and $427,226,000 as of December 31, 2016 and December 26, 2015, respectively. The cost of the shares held by the ESOP totaled $2,642,583,000 and $2,526,652,000 as of December 31, 2016 and December 26, 2015, respectively. Due to the Company’s obligation under the put option, the distributed shares subject to the put option and the shares held by the ESOP are classified as temporary equity in the mezzanine section of the consolidated balance sheets and totaled $3,068,097,000 and $2,953,878,000 as of December 31, 2016 and December 26, 2015, respectively. The fair value of the shares held by the ESOP totaled $8,356,659,000 and $9,201,171,000 as of December 31, 2016 and December 26, 2015, respectively. The Company has a 401(k) Plan for the benefit of eligible employees. The 401(k) Plan is a voluntary defined contribution plan. Eligible employees may contribute up to 10% of their eligible annual compensation, subject to the maximum contribution limits established by federal law. The Company may make a discretionary annual matching contribution to eligible participants of this plan as determined by the Board of Directors. During 2016, 2015 and 2014, the Board of Directors approved a match of 50% of eligible annual contributions up to 3% of annual compensation, not to exceed a maximum match of $750 per employee. The match, which is determined as of the last day of the plan year and paid in the subsequent plan year, is in common stock of the Company. Compensation expense recorded for the Company’s match to the 401(k) Plan was $30,899,000, $30,775,000 and $28,475,000 for 2016, 2015 and 2014, respectively. The Company intends to continue its retirement plans; however, the right to modify, amend, terminate or merge these plans has been reserved. In the event of termination, all amounts contributed under the plans must be paid to the participants or their beneficiaries.

(5) Retirement Plans

The Company has a trusteed, noncontributory ESOP for the benefit of eligible employees. The Company recognizes an expense related to the Company’s discretionary contribution to the ESOP based on a percent of net earnings before taxes that is approved by the Board of Directors each year. ESOP contributions can be made in Company common stock or cash. Compensation expense recorded for contributions to this plan was $334,422,000, $337,703,000 and $310,050,000 for 2016, 2015 and 2014, respectively.

Since the Company’s common stock is not traded on an established securities market, the ESOP includes a put option for shares of the Company’s common stock distributed from the ESOP. Shares are distributed from the ESOP primarily to separated vested participants and certain eligible participants who elect to diversify their account balances. Under the Company’s administration of the ESOP’s put option, if the owners of distributed shares desire to sell their shares, the Company is required to purchase the shares at fair value for a specified time period after distribution of the shares from the ESOP. The fair value of distributed shares subject to the put option totaled $425,514,000 and $427,226,000 as of December 31, 2016 and December 26, 2015, respectively. The cost of the shares held by the ESOP totaled $2,642,583,000 and $2,526,652,000 as of December 31, 2016 and December 26, 2015, respectively. Due to the Company’s obligation under the put option, the distributed shares subject to the put option and the shares held by the ESOP are classified as temporary equity in the mezzanine section of the consolidated balance sheets and totaled $3,068,097,000 and $2,953,878,000 as of December 31, 2016 and December 26, 2015, respectively. The fair value of the shares held by the ESOP totaled $8,356,659,000 and $9,201,171,000 as of December 31, 2016 and December 26, 2015, respectively.

The Company has a 401(k) Plan for the benefit of eligible employees. The 401(k) Plan is a voluntary defined contribution plan. Eligible employees may contribute up to 10% of their eligible annual compensation, subject to the maximum contribution limits established by federal law. The Company may make a discretionary annual matching contribution to eligible participants of this plan as determined by the Board of Directors. During 2016, 2015 and 2014, the Board of Directors approved a match of 50% of eligible annual contributions up to 3% of annual compensation, not to exceed a maximum match of $750 per employee. The match, which is determined as of the last day of the plan year and paid in the subsequent plan year, is in common stock of the Company. Compensation expense recorded for the Company’s match to the 401(k) Plan was $30,899,000, $30,775,000 and $28,475,000 for 2016, 2015 and 2014, respectively.

The Company intends to continue its retirement plans; however, the right to modify, amend, terminate or merge these plans has been reserved. In the event of termination, all amounts contributed under the plans must be paid to the participants or their beneficiaries.