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

Segment Information (Narrative) (Details) $ in Millions	3 Months Ended		6 Months Ended
Segment Information (Narrative) (Details) $ in Millions	Mar. 31, 2018 USD ($)	Mar. 25, 2017 USD ($)	Mar. 31, 2018 USD ($) segment	Mar. 25, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments \| segment			1
Fluid dairy [Member]
Segment Reporting Information [Line Items]
Sales eliminated in consolidation \| $	$ 10.1	$ 11.5	$ 21.4	$ 23.3