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Revenue Recognition - Changes in Deferred Revenue Balances (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Deferred Revenue Arrangement [Line Items] |  |  |
Gross deferred revenue, beginning balance |  | $ 107,200 | $ 113,719
Revenue earned from prior balances |  | (84,465) | (90,939)
Billings during period | [1] | 153,144 | 135,196
Revenue earned for new billings during the period |  | (108,854) | (90,388)
Other adjustments |  | (1,193) | 262
Gross deferred revenue, ending balance |  | 65,832 | 67,850
University Group [Member] | CTU [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Gross deferred revenue, beginning balance |  | 67,245 | 64,674
Revenue earned from prior balances |  | (54,712) | (53,952)
Billings during period | [1] | 100,012 | 86,621
Revenue earned for new billings during the period |  | (68,709) | (58,599)
Other adjustments |  | (1,464) | 599
Gross deferred revenue, ending balance |  | 42,372 | 39,343
University Group [Member] | AIUS [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Gross deferred revenue, beginning balance |  | 39,955 | 49,045
Revenue earned from prior balances |  | (29,753) | (36,987)
Billings during period | [1] | 53,132 | 48,575
Revenue earned for new billings during the period |  | (40,145) | (31,789)
Other adjustments |  | 271 | (337)
Gross deferred revenue, ending balance |  | $ 23,460 | $ 28,507
[1] | Billings during period includes adjustments for prior billings.

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- Definition Contract with customer liability revenue recognized including additions. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Contract with customers new revenue during period. + References No definition available. + Details
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Namespace Prefix: | prdo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition For the current period, the amount of new charges billed to customers for services to be provided for the current academic term. + References No definition available. + Details
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Namespace Prefix: | prdo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition The amount of other adjustments to the deferred revenue balance during the current period. + References No definition available. + Details
Name: | prdo_DeferredRevenueOtherAdjustments
Namespace Prefix: | prdo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The gross amount of deferred revenue before offsetting with any contract asset balances. + References No definition available. + Details
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Namespace Prefix: | prdo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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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Data Type: | xbrli:stringItemType
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- Details
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- Details
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Period Type: |

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