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Leases - Schedule of Future Minimum Sublease Rental Income under Operating Leases for Continuing Operations (Detail) $ in Thousands	Dec. 31, 2019 USD ($)
Leases [Abstract]
Operating Subleases, 2020	$ 2,632	[1]
Operating Subleases, 2021	1,081
Operating Subleases, 2022	777
Operating Subleases, 2023	330
Operating Subleases, Total	$ 4,820
[1] Sublease receivables remaining as of December 31, 2019

X

- Definition

Amount of minimum sublease rentals to be received by the seller-lessee for all operating leases.

+ References

No definition available.

+ Details

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Namespace Prefix:	prdo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of minimum sublease rentals to be received by the seller-lessee in the next four fiscal years.

+ References

No definition available.

+ Details

Name:	prdo_FutureMinimumSubleaseRentalsUnderOperatingLeasesWithinFourYears
Namespace Prefix:	prdo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of minimum sublease rentals to be received by the seller-lessee in the next fiscal year.

+ References

No definition available.

+ Details

Name:	prdo_FutureMinimumSubleaseRentalsUnderOperatingLeasesWithinOneYear
Namespace Prefix:	prdo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of minimum sublease rentals to be received by the seller-lessee in the next three fiscal years.

+ References

No definition available.

+ Details

Name:	prdo_FutureMinimumSubleaseRentalsUnderOperatingLeasesWithinThreeYears
Namespace Prefix:	prdo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of minimum sublease rentals to be received by the seller-lessee in the next two fiscal years.

+ References

No definition available.

+ Details

Name:	prdo_FutureMinimumSubleaseRentalsUnderOperatingLeasesWithinTwoYears
Namespace Prefix:	prdo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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