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Credit Agreement - Schedule of Credit Agreement (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2022 USD ($)
Line Of Credit Facility [Line Items] |
Letters of credit, borrowing limit under the credit agreement | $ 125,000,000.0
2021 Letter of Credit [Member] |
Line Of Credit Facility [Line Items] |
Discount interest rate to prime | 1.00%
Letter of credit, prime rate | 7.50%
Line of credit interest rate | 6.50%
2021 Letter of Credit [Member] | Minimum [Member] |
Line Of Credit Facility [Line Items] |
Line of credit facility, interest rate | 3.00%

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- Definition Discount interest rate to prime. + References No definition available. + Details
Name: | prdo_DiscountInterestRateToPrime
Namespace Prefix: | prdo_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line Of Credit Facility Interest Rate Prime Minus One. + References No definition available. + Details
Name: | prdo_LineOfCreditFacilityInterestRatePrimeMinusOne
Namespace Prefix: | prdo_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The effective interest rate during the reporting period. + 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 210.5-02.19(b),22(b)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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Period Type: | duration

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

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- 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 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 210.5-02.19(b),22(b)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |