REVENUE - Schedule of Remaining Performance Obligations (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 1,424,742	$ 1,308,084
Revenue remaining performance obligation (in percent)	100.00%	100.00%
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
Revenue remaining performance obligation (in percent)		54.00%
Expected timing of satisfaction		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	$ 758,954	$ 317,620
Revenue remaining performance obligation (in percent)	53.00%	24.00%
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	$ 370,004	$ 169,449
Revenue remaining performance obligation (in percent)	26.00%	13.00%
Expected timing of satisfaction	1 year	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	$ 187,435	$ 114,257
Revenue remaining performance obligation (in percent)	13.00%	9.00%
Expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 108,349
Revenue remaining performance obligation (in percent)	8.00%
Expected timing of satisfaction
Pega Cloud
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 991,113	$ 866,723
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
Expected timing of satisfaction		1 year
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	$ 461,928	$ 239,228
Expected timing of satisfaction	1 year	1 year
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	$ 292,787	$ 131,085
Expected timing of satisfaction	1 year	1 year
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	$ 149,797	$ 106,778
Expected timing of satisfaction	1 year
Pega Cloud | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 86,601
Expected timing of satisfaction
Maintenance
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 345,160	$ 338,361
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
Expected timing of satisfaction		1 year
Maintenance | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 225,598	$ 66,272
Expected timing of satisfaction	1 year	1 year
Maintenance | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 65,605	$ 29,295
Expected timing of satisfaction	1 year	1 year
Maintenance | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 32,307	$ 7,479
Expected timing of satisfaction	1 year
Maintenance | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 21,650
Expected timing of satisfaction
Subscription license
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 46,994	$ 45,338
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
Expected timing of satisfaction		1 year
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	$ 33,985	$ 3,215
Expected timing of satisfaction	1 year	1 year
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	$ 10,008	$ 6,777
Expected timing of satisfaction	1 year	1 year
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	$ 2,903	$ 0
Expected timing of satisfaction	1 year
Subscription license | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 98
Expected timing of satisfaction
Perpetual license
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 2,727	$ 7,514
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
Expected timing of satisfaction		1 year
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	$ 2,727	$ 2,252
Expected timing of satisfaction	1 year	1 year
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
Expected timing of satisfaction	1 year	1 year
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	$ 0
Expected timing of satisfaction	1 year
Perpetual license | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 0
Expected timing of satisfaction
Consulting
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 38,748	$ 50,148
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
Expected timing of satisfaction		1 year
Consulting | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 34,716	$ 6,653
Expected timing of satisfaction	1 year	1 year
Consulting | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 1,604	$ 2,292
Expected timing of satisfaction	1 year	1 year
Consulting | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 2,428	$ 0
Expected timing of satisfaction	1 year
Consulting | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 0
Expected timing of satisfaction