Redeemable Convertible Preferred Stock - Schedule of Preferred Stock (Details) - USD ($) $ in Thousands	12 Months Ended
Apr. 28, 2024	Apr. 30, 2023
Increase (Decrease) in Temporary Equity
Beginning balance	$ 53,468	$ 52,218
Issuance of shares	19,843
Remeasurement to Redemption Amount	1,423
Accretion of Cumulative Dividends	878
Conversion in connection with the Reverse Recapitalization	(75,612)
Ending balance	0	53,468
Series A Preferred Stock
Increase (Decrease) in Temporary Equity
Beginning balance	1,151
Conversion in connection with the Reverse Recapitalization	(1,151)
Ending balance	0	1,151
Series B Preferred Stock
Increase (Decrease) in Temporary Equity
Beginning balance	930
Conversion in connection with the Reverse Recapitalization	(930)
Ending balance	0	930
Series C Preferred Stock
Increase (Decrease) in Temporary Equity
Beginning balance	300
Conversion in connection with the Reverse Recapitalization	(300)
Ending balance	0	300
Series D Preferred Stock
Increase (Decrease) in Temporary Equity
Beginning balance	10,340
Conversion in connection with the Reverse Recapitalization	(10,340)
Ending balance	0	10,340
Series E Preferred Stock
Increase (Decrease) in Temporary Equity
Beginning balance	2,207
Conversion in connection with the Reverse Recapitalization	(2,207)
Ending balance	0	2,207
Series F Preferred Stock
Increase (Decrease) in Temporary Equity
Beginning balance	27,290
Conversion in connection with the Reverse Recapitalization	(27,290)
Ending balance	0	27,290
Series G Preferred Stock
Increase (Decrease) in Temporary Equity
Beginning balance	3,550
Issuance of shares		1,050
Conversion in connection with the Reverse Recapitalization	(3,550)
Ending balance	0	3,550
Series H Preferred Stock
Increase (Decrease) in Temporary Equity
Beginning balance	7,700
Issuance of shares		200
Conversion in connection with the Reverse Recapitalization	(7,700)
Ending balance	0	7,700
Series I Preferred Stock
Increase (Decrease) in Temporary Equity
Beginning balance	0
Issuance of shares	19,843
Remeasurement to Redemption Amount	1,423
Accretion of Cumulative Dividends	878
Conversion in connection with the Reverse Recapitalization	(22,144)
Ending balance	$ 0	$ 0

Temporary Equity, Conversion Of Stock, Reverse Recapitalization

No definition available.

Name:	pnst_TemporaryEquityConversionOfStockReverseRecapitalization
Namespace Prefix:	pnst_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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

- Definition

Value of accretion of temporary equity during the period due to unpaid dividends.

+ References

No definition available.

+ Details

Name:	us-gaap_TemporaryEquityAccretionOfDividends
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Value of accretion of temporary equity to its redemption value during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_TemporaryEquityAccretionToRedemptionValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(23)(a)(1))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.E.Q2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(i))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480097/470-10-S99-1A

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(iv))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480097/470-10-S99-1A

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(5))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480097/470-10-S99-1A

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(i))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480097/470-10-S99-1B

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(iv))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480097/470-10-S99-1B

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(5))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480097/470-10-S99-1B

+ Details

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

- Definition

Value of new stock classified as temporary equity issued during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_SeriesAPreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_SeriesBPreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_SeriesCPreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_SeriesDPreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_SeriesEPreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_SeriesFPreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_SeriesGPreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_SeriesHPreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=pnst_SeriesIPreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: