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v3.20.2

Segment Reporting - Additional Information (Detail) | 9 Months Ended
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Sep. 30, 2020 Segment
Segment Reporting Information [Line Items] |
Number of reporting segments | 2
CTU [Member] |
Segment Reporting Information [Line Items] |
Students enrolled expressed as percentage of enrollment | 56.00%
CTU [Member] | Fully Online [Member] |
Segment Reporting Information [Line Items] |
Percentage of enrollment | 95.00%
AIU [Member] |
Segment Reporting Information [Line Items] |
Students enrolled expressed as percentage of enrollment | 44.00%
Acquisition date | Mar. 02, 2020
AIU [Member] | Fully Online [Member] |
Segment Reporting Information [Line Items] |
Percentage of enrollment | 97.00%

X
- Definition Percentage of enrollment. + References No definition available. + Details
Name: | prdo_PercentageOfEnrollment
Namespace Prefix: | prdo_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of student enrollment for a specific group of the total entity. + References No definition available. + Details
Name: | prdo_PercentageOfStudentEnrollment
Namespace Prefix: | prdo_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e848-128460 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e845-128460 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8672-108599 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=prdo_CTUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=prdo_FullyOnlineProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=prdo_AIUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |