Impact of the Tax Act and the ASU (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018
Net Earnings Excluding Unrealized Gain (Loss) [Abstract]
Net Earnings Excluding Unrealized Gain (Loss)	$ 656,600	$ 580,300	$ 637,000	$ 741,700	$ 660,300	$ 582,000	$ 571,000	$ 704,200
Earnings Per Share Excluding Unrealized Gain (Loss)	$ 0.93	$ 0.81	$ 0.89	$ 1.04	$ 0.92	$ 0.80	$ 0.78	$ 0.96