REVENUE - Performance Obligations (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 1,176,337	$ 979,810
Revenue remaining performance obligation, percentage	100.00%	100.00%
1 year or less
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 654,211	$ 543,946
Revenue remaining performance obligation, percentage	55.00%	55.00%
1-2 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 304,316	$ 251,239
Revenue remaining performance obligation, percentage	26.00%	26.00%
2-3 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 148,323	$ 134,009
Revenue remaining performance obligation, percentage	13.00%	14.00%
Greater than 3 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 69,487	$ 50,616
Revenue remaining performance obligation, percentage	6.00%	5.00%
Maintenance
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 349,082	$ 322,637
Maintenance | 1 year or less
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	228,984	220,100
Maintenance | 1-2 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	63,870	52,366
Maintenance | 2-3 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	33,617	33,337
Maintenance | Greater than 3 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	22,611	16,834
Pega Cloud
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	689,484	564,316
Pega Cloud | 1 year or less
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	329,857	252,104
Pega Cloud | 1-2 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	208,875	187,456
Pega Cloud | 2-3 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	106,156	91,861
Pega Cloud | Greater than 3 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	44,596	32,895
Subscription license
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	67,719	58,331
Subscription license | 1 year or less
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	47,428	41,025
Subscription license | 1-2 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	16,111	9,874
Subscription license | 2-3 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	2,422	7,055
Subscription license | Greater than 3 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	1,758	377
Perpetual license
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	14,038	10,278
Perpetual license | 1 year or less
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	7,281	9,649
Perpetual license | 1-2 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	4,505	629
Perpetual license | 2-3 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	2,252	0
Perpetual license | Greater than 3 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	0	0
Consulting
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	56,014	24,248
Consulting | 1 year or less
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	40,661	21,068
Consulting | 1-2 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	10,955	914
Consulting | 2-3 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	3,876	1,756
Consulting | Greater than 3 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 522	$ 510
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Disaggregation of Revenue [Line Items]
Expected timing of satisfaction		2 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01
Disaggregation of Revenue [Line Items]
Expected timing of satisfaction		1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Disaggregation of Revenue [Line Items]
Expected timing of satisfaction	2 years	3 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-04-01
Disaggregation of Revenue [Line Items]
Expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Disaggregation of Revenue [Line Items]
Expected timing of satisfaction	3 years	3 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Disaggregation of Revenue [Line Items]
Expected timing of satisfaction	3 years