Restructuring and Divestiture Net Charges - Table of Charges Taken Related to Restructuring Actions (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended		12 Months Ended
	Mar. 30, 2013	Mar. 24, 2012	Sep. 29, 2012
Restructuring Cost and Reserve [Line Items]
Non-cash impairment charge	$ 47	$ 15,316	$ 16,901
Purchase orders and other contractual obligations			3,099
Workforce reductions			15,249
Facility closure costs			430
Other			900
Fiscal charges			36,579
Recorded to cost of product sales			19,064
Recorded to restructuring			17,515
Fiscal charges			36,579
Non-cash impairment charges	(47)	(15,316)	(16,901)
Stock compensation	(6,079)		(3,500)
Severance payments	(11,493)		(2,629)
Payments related to purchase orders and other contractual obligations	(828)		(2,572)
Other payments			(430)
Acquired			83
Foreign exchange and other adjustments	(22)		113
Balance	9,371		10,743
Fiscal 2013 charges [Member] | Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Workforce reductions	16,199
Facility closure costs	184
Other	714
Fiscal charges	17,097
Fiscal charges	17,097
Abandonment of Adiana Product Line [Member]
Restructuring Cost and Reserve [Line Items]
Non-cash impairment charge			16,316
Purchase orders and other contractual obligations			3,099
Workforce reductions			128
Fiscal charges			19,543
Recorded to cost of product sales			19,064
Recorded to restructuring			479
Fiscal charges			19,543
Non-cash impairment charges			(16,316)
Severance payments			(128)
Payments related to purchase orders and other contractual obligations	(527)		(2,572)
Balance			527
Consolidation of Diagnostics Operations [Member]
Restructuring Cost and Reserve [Line Items]
Non-cash impairment charge			585
Workforce reductions			14,202
Fiscal charges			14,787
Recorded to restructuring			14,787
Fiscal charges			14,787
Non-cash impairment charges			(585)
Stock compensation	(6,079)		(3,500)
Severance payments	(11,370)		(2,423)
Acquired			83
Foreign exchange and other adjustments	(3)		22
Balance	3,468		8,384
Consolidation of Diagnostics Operations [Member] | Fiscal 2013 charges [Member] | Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Workforce reductions	12,536
Fiscal charges	12,536
Fiscal charges	12,536
Closure of Indianapolis Facility [Member]
Restructuring Cost and Reserve [Line Items]
Workforce reductions			879
Other			900
Fiscal charges			1,779
Recorded to restructuring			1,779
Fiscal charges			1,779
Severance payments	(70)
Payments related to purchase orders and other contractual obligations	(273)
Balance	5,177		1,779
Closure of Indianapolis Facility [Member] | Fiscal 2013 charges [Member] | Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Workforce reductions	3,027
Other	714
Fiscal charges	3,741
Fiscal charges	3,741
Other Operating Cost Reductions [Member]
Restructuring Cost and Reserve [Line Items]
Non-cash impairment charge	47
Workforce reductions			40
Facility closure costs			430
Fiscal charges			470
Recorded to restructuring			470
Fiscal charges			470
Non-cash impairment charges	(47)
Severance payments	(53)		(78)
Payments related to purchase orders and other contractual obligations	(28)
Other payments			(430)
Foreign exchange and other adjustments	(19)		91
Balance	726		53
Other Operating Cost Reductions [Member] | Fiscal 2013 charges [Member] | Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Workforce reductions	636
Facility closure costs	184
Fiscal charges	820
Fiscal charges	$ 820