Restructuring Charges - Additional information (Detail) (USD $)	3 Months Ended						12 Months Ended	3 Months Ended	12 Months Ended		3 Months Ended	12 Months Ended	3 Months Ended
	Dec. 29, 2012	Dec. 24, 2011	Dec. 29, 2012 Indiana [Member ]	Sep. 29, 2012 Indiana [Member ]	Dec. 29, 2012 Consolidation of Diagnostics Operations [Member]	Sep. 29, 2012 Consolidation of Diagnostics Operations [Member]	Sep. 29, 2012 Consolidation of Diagnostics Operations [Member]	Dec. 29, 2012 Consolidation of Diagnostics Operations [Member] Restructuring [Member]	Sep. 29, 2012 Consolidation of Selenium Panel Coating Production [Member] Minimum [Member]	Sep. 29, 2012 Consolidation of Selenium Panel Coating Production [Member] Maximum [Member]	Mar. 24, 2012 Abandonment of Adiana Product Line [Member]	Sep. 29, 2012 Abandonment of Adiana Product Line [Member]	Dec. 29, 2012 Closure of Indianapolis Facility [Member]	Sep. 29, 2012 Closure of Indianapolis Facility [Member]	Dec. 29, 2012 Closure of Indianapolis Facility [Member] Restructuring [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						13,300,000	900,000		1,200,000	1,400,000		100,000		900,000	1,500,000
Restructuring charges not recorded in cost of product sales												300,000
Stock-based compensation expense	12,066,000	8,657,000					3,500,000	200,000
Additional severance charges								800,000
Estimated aggregate severance charges					6,400,000								6,400,000
Exiting charges							600,000	1,000,000
State of Indiana employee credits accrual			$ 700,000	$ 900,000