Segment Reporting - Additional Information (Detail)	9 Months Ended
Sep. 30, 2021 Segment University
Segment Reporting Information [Line Items]
Number of reporting segments \| Segment	2
Hippo Education, LLC [Member]
Segment Reporting Information [Line Items]
Acquisition date	Sep. 10, 2021
DigitalCrafts [Member]
Segment Reporting Information [Line Items]
Acquisition date	Aug. 02, 2021
CTU [Member]
Segment Reporting Information [Line Items]
Students enrolled expressed as percentage of enrollment	61.00%
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	39.00%
Number of Universities \| University	2
AIU [Member] \| Trident University [Member]
Segment Reporting Information [Line Items]
Acquisition date	Mar. 02, 2020
AIU [Member] \| Fully Online [Member]
Segment Reporting Information [Line Items]
Percentage of enrollment	97.00%

AIU number of universities.

No definition available.

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Namespace Prefix:	prdo_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of enrollment.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

The percentage of student enrollment for a specific group of the total entity.

+ References

No definition available.

+ Details

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Date when the acquirer obtains control of the acquiree, in YYYY-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
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
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-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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- 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=123359005&loc=d3e8672-108599

+ Details

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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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- Details

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Namespace Prefix:
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- Details

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Balance Type:
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- Details

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Namespace Prefix:
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- Details

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- Details

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Namespace Prefix:
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- Details

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