RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE - Summary of Unbilled Receivables (Details) $ in Thousands	Mar. 31, 2022 USD ($)
Receivables [Abstract]
1 year or less	$ 226,052
1-2 years	88,003
2-5 years	47,972
Total	$ 362,027
Percentage of unbilled receivables, 1 year or less	62.00%
Percentage of unbilled receivables, 1-2 years	25.00%
Percentage of unbilled receivables, 2-5 years	13.00%
Total percentage of unbilled receivables	100.00%

Unbilled Receivables Current and Non Current

No definition available.

Name:	pega_UnbilledReceivablesCurrentAndNonCurrent
Namespace Prefix:	pega_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Unbilled receivables current and non current percentage.

+ References

No definition available.

+ Details

Name:	pega_UnbilledReceivablesCurrentAndNonCurrentPercentage
Namespace Prefix:	pega_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Unbilled receivables not billable at balance sheet date amount expected to be collected within year one and two.

+ References

No definition available.

+ Details

Name:	pega_UnbilledReceivablesNotBillableAtBalanceSheetDateAmountExpectedToBeCollectedWithinYearOneAndTwo
Namespace Prefix:	pega_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Unbilled Receivables Not Billable at Balance Sheet Date Amount Expected to be Collected within Year One or Less

+ References

No definition available.

+ Details

Name:	pega_UnbilledReceivablesNotBillableAtBalanceSheetDateAmountExpectedToBeCollectedWithinYearOneOrLess
Namespace Prefix:	pega_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Unbilled receivables not billable at balance sheet date amount expected to be collected within year two and five.

+ References

No definition available.

+ Details

Name:	pega_UnbilledReceivablesNotBillableAtBalanceSheetDateAmountExpectedToBeCollectedWithinYearTwoAndFive
Namespace Prefix:	pega_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Unbilled receivables not billable at balance sheet date expected percentage to be collected within one year.

+ References

No definition available.

+ Details

Name:	pega_UnbilledReceivablesNotBillableAtBalanceSheetDateExpectedPercentageToBeCollectedWithinOneYear
Namespace Prefix:	pega_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Unbilled receivables not billable at balance sheet date expected percentage to be collected within year one and two.

+ References

No definition available.

+ Details

Name:	pega_UnbilledReceivablesNotBillableAtBalanceSheetDateExpectedPercentageToBeCollectedWithinYearOneAndTwo
Namespace Prefix:	pega_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Unbilled receivables not billable at balance sheet date expected percentage to be collected within year two and five.

+ References

No definition available.

+ Details

Name:	pega_UnbilledReceivablesNotBillableAtBalanceSheetDateExpectedPercentageToBeCollectedWithinYearTwoAndFive
Namespace Prefix:	pega_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- References

No definition available.

+ Details

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