Debt Instrument Amount Redeemable

No definition available.

Name:	prmw_DebtInstrumentAmountRedeemable
Namespace Prefix:	prmw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Debt Instrument, Financing Fee, Amortization Period

+ References

No definition available.

+ Details

Name:	prmw_DebtInstrumentFinancingFeeAmortizationPeriod
Namespace Prefix:	prmw_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of the fee that accompanies borrowing money under the debt instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentFeeAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=prmw_FivePointFiveZeroZeroPercentSeniorNotesDueInTwoThousandTwentyFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=prmw_SixPointSevenFiveZeroPercentSeniorNotesDueInTwoThousandTwentyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=prmw_TenPointZeroPercentSeniorNotesDueInTwoThousandTwentyOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt - 5.500% Senior Notes due in 2025 (Details) - USD ($)	1 Months Ended
	Mar. 31, 2017	Jan. 02, 2021	Dec. 28, 2019
5.500% Senior Notes Due in 2025
Debt Instrument [Line Items]
Interest rate on notes (as a percent)		5.50%
5.500% Senior Notes Due in 2025 \| Senior Notes
Debt Instrument [Line Items]
Interest rate on notes (as a percent)	5.50%	5.50%
Debt face amount	$ 750,000,000.0	$ 750,000,000.0	$ 750,000,000.0
Financing fees	$ 11,700,000
Financing fees, amortization period	8 years
6.750% Senior Notes Due in 2020 \| Senior Notes
Debt Instrument [Line Items]
Interest rate on notes (as a percent)	6.75%
Amount to be repaid	$ 625,000,000.0
10.000% Senior Notes Due in 2021 \| Senior Notes
Debt Instrument [Line Items]
Interest rate on notes (as a percent)	10.00%
Amount to be repaid	$ 100,000,000.0