Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 26, 2020	Dec. 28, 2019	Dec. 26, 2020	Dec. 28, 2019
Statements of Income and Comprehensive Income [Abstract]
Net income	$ 183,945	$ 146,050	$ 353,459	$ 286,206
Change in net unrealized gains and losses on available-for-sale securities, net of tax benefit (expense) of $7, $(3), $16 and $(17) respectively	(35)	0	(115)	118
Change in net unrealized gains and losses on cash flow hedges, net of tax benefit (expense) of $(71), $(117), $(94) and $48 respectively	343	610	406	(249)
Change in net unrealized gains and losses on post-retirement benefits, net of tax benefit (expense) of $14, $(20), $25 and $(42), respectively	19	98	36	196
Other Comprehensive Income (Loss), Net of Tax	327	708	327	65
Total comprehensive income	184,272	146,758	353,786	286,271
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	14	(20)	25	(42)
Net income	183,945	146,050	353,459	286,206
Change in net unrealized gains and losses on available-for-sale securities, net of tax benefit (expense) of $7, $(3), $16 and $(17) respectively	(35)	0	(115)	118
Change in net unrealized gains and losses on cash flow hedges, net of tax benefit (expense) of $(71), $(117), $(94) and $48 respectively	343	610	406	(249)
Change in net unrealized gains and losses on post-retirement benefits, net of tax benefit (expense) of $14, $(20), $25 and $(42), respectively	19	98	36	196
Other Comprehensive Income (Loss), Net of Tax	327	708	327	65
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	184,272	146,758	353,786	286,271
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	14	(20)	25	(42)
Other Comprehensive Income (Loss), Tax	(50)	(140)	(53)	(11)
Comprehensive (Income) Loss, Available-for-Sale Securities, Tax Benefit	7	(3)	16	(17)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	$ (71)	$ (117)	$ (94)	$ 48