Basis of Presentation and Summary of Significant Accounting Policies (Details)	6 Months Ended	12 Months Ended	0 Months Ended
Mar. 29, 2013 segment	Sep. 28, 2012	Sep. 30, 2011	Sep. 28, 2012 ADT	Sep. 28, 2012 Pentair
Basis of Presentation
Number of common shares received under spin-off transaction				0.50	0.24
Number of reporting segments	3
Number of weeks in fiscal year	364 days	364 days	371 days

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

No definition available.

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration