Debt Instrument, covenant minimum domestic cash and cash equivalents and subsidiary guarantors.

No definition available.

Name:	prdo_DebtInstrumentCovenantMinimumDomesticCashAndCashEquivalentsAndSubsidiaryGuarantors
Namespace Prefix:	prdo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Debt instrument, covenant minimum required cash and cash equivalentsin domestic accounts.

+ References

No definition available.

+ Details

Name:	prdo_DebtInstrumentCovenantMinimumRequiredCashAndCashEquivalentsinDomesticAccounts
Namespace Prefix:	prdo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line of credit facility interest rate prime.

+ References

No definition available.

+ Details

Name:	prdo_LineOfCreditFacilityInterestRatePrime
Namespace Prefix:	prdo_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Stock repurchase prior program expiration date.

+ References

No definition available.

+ Details

Name:	prdo_StockRepurchasePriorProgramExpirationDate
Namespace Prefix:	prdo_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the credit facility terminates, in YYYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of increase (decrease), classified as other, of the credit facility.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(f))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

+ Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Expiration date for the purchase of an entity's own shares under a stock repurchase plan, in the YYYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramExpirationDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481674/830-30-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483399/855-10-50-2

+ Details

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

- Details

Name:	us-gaap_CreditFacilityAxis=prdo_SeniorSecuredRevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=prdo_WintrustBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Subsequent Events - Additional Information (Detail) - USD ($)					12 Months Ended
	Mar. 01, 2024	Jan. 23, 2024	Apr. 01, 2022	Jan. 27, 2022	Dec. 31, 2023	Sep. 08, 2021
Subsequent Event [Line Items]
Letters of credit, borrowing limit under the credit agreement					$ 125,000,000
Stock repurchase authorized amount				$ 50,000,000
Expiration Date				Sep. 30, 2023
Expiration Date				Feb. 28, 2022
Revolving Credit Facility [Member] \| Wintrust Bank [Member] \| Credit Agreement [Member]
Subsequent Event [Line Items]
Revolving credit facility maturity date					Sep. 08, 2024
Line of credit facility interest rate prime			4.00%
Letters of credit, borrowing limit under the credit agreement						$ 125,000,000
Subsequent Event [Member]
Subsequent Event [Line Items]
Stock repurchase authorized amount	$ 50,000,000
Expiration Date	Sep. 30, 2025
Expiration Date	Sep. 30, 2024
Subsequent Event [Member] \| Revolving Credit Facility [Member] \| Wintrust Bank [Member] \| Credit Agreement [Member]
Subsequent Event [Line Items]
Revolving credit facility maturity date		Jan. 31, 2027
Line of credit facility interest rate prime		3.00%
Letters of credit, borrowing limit under the credit agreement		$ 125,000,000
Line of credit facility, increase		50,000,000
Minimum domestic cash and cash equivalents and subsidiary guarantors covenant		156,250,000
Minimum required cash and cash equivalents in domestic accounts covenant.		$ 156,250,000