Restructuring and Divestiture Net Charges - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended		3 Months Ended			12 Months Ended	3 Months Ended		12 Months Ended	3 Months Ended		6 Months Ended	3 Months Ended		6 Months Ended	3 Months Ended	6 Months Ended
	Mar. 30, 2013	Mar. 24, 2012	Mar. 30, 2013	Mar. 24, 2012	Dec. 29, 2012 Indiana [Member ]	Sep. 29, 2012 Indiana [Member ]	Mar. 24, 2012 Abandonment of Adiana Product Line [Member]	Sep. 29, 2012 Abandonment of Adiana Product Line [Member]	Mar. 30, 2013 Consolidation of Diagnostics Operations [Member]	Sep. 29, 2012 Consolidation of Diagnostics Operations [Member]	Sep. 29, 2012 Consolidation of Diagnostics Operations [Member]	Mar. 30, 2013 Consolidation of Diagnostics Operations [Member] Restructuring [Member]	Dec. 29, 2012 Consolidation of Diagnostics Operations [Member] Restructuring [Member]	Mar. 30, 2013 Consolidation of Diagnostics Operations [Member] Restructuring [Member]	Sep. 29, 2012 Closure of Indianapolis Facility [Member]	Mar. 30, 2013 Closure of Indianapolis Facility [Member] Restructuring [Member]	Mar. 30, 2013 Closure of Indianapolis Facility [Member] Restructuring [Member]	Mar. 30, 2013 Consolidation of Selenium Panel Coating Production [Member]	Mar. 30, 2013 Consolidation of Selenium Panel Coating Production [Member]
Restructuring Cost and Reserve [Line Items]
Divestiture charges							$ 18,300,000	$ 19,500,000
Restructuring charges - cost of product sales								19,100,000
Other restructuring charges								400,000
Impairment charges related to inventory								9,900,000
Impairment charges related to manufacturing equipment								6,500,000
Charges related to outstanding contractual obligations								2,700,000
Severance Charges								100,000		13,300,000	900,000		800,000		900,000	1,500,000	3,000,000	600,000
Restructuring charges not recorded in cost of product sales								300,000
Stock-based compensation expense	19,013,000	8,949,000	31,079,000	17,606,000							3,500,000		200,000
Employee retention program, payments in cash	9,700,000
Estimated aggregate severance charges									6,100,000						6,100,000
Exiting charges					700,000	900,000					600,000	1,000,000		2,000,000
Estimated severance charges																			1,000,000
Lease obligation charge and write-off of related leaseholds	200,000
Gain on the sale of LIFECODES business	$ 900,000		$ 900,000