Discount interest rate to prime.

No definition available.

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- Definition

Percentage of unrestricted cash, cash equivalents and short term investments.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

The amount of restricted payments the Company may make on an annual basis, including payments in connection with a repurchase of shares of common stock, under the Credit Agreement.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the 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))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

+ 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(f))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

+ Details

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

- Definition

The effective interest rate during the reporting period.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- 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

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Data Type:	xbrli:stringItemType
Balance Type:	na
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

- Details

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- Details

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- Details

Name:	srt_RangeAxis=srt_MinimumMember
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- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_PrimeMember
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- Details

Name:	us-gaap_CreditFacilityAxis=prdo_SeniorSecuredRevolvingCreditFacilityMember
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- Details

Name:	srt_RangeAxis=srt_MaximumMember
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- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
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Name:	us-gaap_LineOfCreditFacilityAxis=prdo_BMOHarrisBankMember
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Credit Agreement - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Sep. 08, 2021	Dec. 27, 2018
Line Of Credit Facility [Line Items]
Revolving credit facility	$ 125,000,000.0
Credit Agreement [Member]
Line Of Credit Facility [Line Items]
Line of credit facility, interest rate	0.00%	0.00%
Credit Agreement [Member] \| Wintrust Bank [Member]
Line Of Credit Facility [Line Items]
Discount interest rate to prime	1.00%
Credit Agreement [Member] \| Wintrust Bank [Member] \| Minimum [Member] \| Prime [Member]
Line Of Credit Facility [Line Items]
Line of credit facility, interest rate	3.00%
Credit Agreement [Member] \| Revolving Credit Facility [Member] \| Wintrust Bank [Member]
Line Of Credit Facility [Line Items]
Revolving credit facility			$ 125,000,000.0
Revolving credit facility maturity date	Sep. 08, 2024
Credit Agreement [Member] \| Revolving Credit Facility [Member] \| Wintrust Bank [Member] \| Maximum [Member]
Line Of Credit Facility [Line Items]
Line of credit facility, increase	$ 50,000,000.0
Restricted payments covenant	$ 100,000,000.0
Percentage of unrestricted cash cash equivalents and short term investments	125.00%
Credit Agreement [Member] \| Revolving Credit Facility \| BMO Harris Bank N.A. ("BMO Harris") [Member]
Line Of Credit Facility [Line Items]
Credit facility borrowings	$ 0	$ 0		$ 50,000,000.0