Geographic Information (Detail) (USD $)	3 Months Ended									12 Months Ended
	Sep. 26, 2014	Jun. 27, 2014	Mar. 28, 2014		Dec. 27, 2013	Sep. 27, 2013	Jun. 28, 2013	Mar. 29, 2013	Dec. 28, 2012	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
Segment Reporting Information [Line Items]
Revenues	$ 812,100,000	$ 747,700,000	$ 778,500,000	[1]	$ 711,500,000	$ 769,900,000	$ 726,200,000	$ 768,400,000	$ 678,400,000	$ 3,049,800,000	$ 2,942,897,000	$ 2,807,015,000
Long-lived Assets	338,000,000					315,300,000				338,000,000	315,300,000	296,600,000
United States
Segment Reporting Information [Line Items]
Revenues										1,264,400,000	1,212,400,000	1,156,100,000
Long-lived Assets	262,700,000					237,800,000				262,700,000	237,800,000	228,600,000
International
Segment Reporting Information [Line Items]
Revenues										1,785,400,000	1,730,500,000	1,650,900,000
Long-lived Assets	$ 75,300,000					$ 77,500,000				$ 75,300,000	$ 77,500,000	$ 68,000,000

[1] In the second fiscal quarter of 2014, net earnings include a $25.1 million litigation charge related to a settlement agreement with the University of Pittsburgh.