Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014 Omnifrio Single-Serve Beverage Business [Member]	Dec. 31, 2013 Omnifrio Single-Serve Beverage Business [Member]	Aug. 05, 2014 Prism Arbitration [Member]
Omnifrio Single-Serve Beverage Business [Abstract]
Deferred purchase price payments	$ 2,000	$ 2,000
Arbitration damaged claim value			$ 1,000

Amount of deferred purchase price payments included within current liabilities of disposal group held for sale.

No definition available.

Name:	prmw_DeferredPurchasePricePaymentsIncludedWithinCurrentLiabilitiesOfDisposalGroupHeldForSale
Namespace Prefix:	prmw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant