REVENUE - Performance Obligations (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 1,308,084	$ 1,176,337
Revenue remaining performance obligation (in percent)	100.00%	100.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation		$ 654,211
Revenue remaining performance obligation (in percent)		55.00%
Expected timing of satisfaction		1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 706,758	$ 304,316
Revenue remaining performance obligation (in percent)	54.00%	26.00%
Expected timing of satisfaction	1 year	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 317,620	$ 148,323
Revenue remaining performance obligation (in percent)	24.00%	13.00%
Expected timing of satisfaction	1 year	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 169,449	$ 69,487
Revenue remaining performance obligation (in percent)	13.00%	6.00%
Expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 114,257
Revenue remaining performance obligation (in percent)	9.00%
Expected timing of satisfaction
Maintenance
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 338,361	$ 349,082
Maintenance | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation		228,984
Maintenance | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	235,315	63,870
Maintenance | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	66,272	33,617
Maintenance | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	29,295	22,611
Maintenance | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	7,479
Pega Cloud
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	866,723	689,484
Pega Cloud | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation		329,857
Pega Cloud | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	389,632	208,875
Pega Cloud | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	239,228	106,156
Pega Cloud | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	131,085	44,596
Pega Cloud | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	106,778
Subscription license
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	45,338	67,719
Subscription license | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation		47,428
Subscription license | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	35,346	16,111
Subscription license | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	3,215	2,422
Subscription license | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	6,777	1,758
Subscription license | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	0
Perpetual license
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	7,514	14,038
Perpetual license | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation		7,281
Perpetual license | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	5,262	4,505
Perpetual license | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	2,252	2,252
Perpetual license | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	0	0
Perpetual license | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	0
Consulting
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	50,148	56,014
Consulting | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation		40,661
Consulting | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	41,203	10,955
Consulting | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	6,653	3,876
Consulting | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	2,292	$ 522
Consulting | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 0