REVENUE - Schedule of Remaining Performance Obligations (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 1,728,499	$ 1,424,742
Revenue remaining performance obligation (in percent)	100.00%	100.00%
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
Revenue remaining performance obligation (in percent)		53.00%
Expected timing of satisfaction		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	$ 880,360	$ 370,004
Revenue remaining performance obligation (in percent)	50.00%	26.00%
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	$ 411,081	$ 187,435
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]: 2027-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 199,913	$ 108,349
Revenue remaining performance obligation (in percent)	12.00%	8.00%
Expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 237,145
Revenue remaining performance obligation (in percent)	14.00%
Expected timing of satisfaction
Pega Cloud
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 1,251,111	$ 991,113
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
Expected timing of satisfaction		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	$ 572,341	$ 292,787
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	$ 331,572	$ 149,797
Expected timing of satisfaction	1 year	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	$ 161,259	$ 86,601
Expected timing of satisfaction	1 year
Pega Cloud | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 185,939
Expected timing of satisfaction
Maintenance
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 384,398	$ 345,160
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
Expected timing of satisfaction		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	$ 229,180	$ 65,605
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	$ 73,500	$ 32,307
Expected timing of satisfaction	1 year	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	$ 37,779	$ 21,650
Expected timing of satisfaction	1 year
Maintenance | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 43,939
Expected timing of satisfaction
Subscription license
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 44,866	$ 46,994
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
Expected timing of satisfaction		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	$ 33,202	$ 10,008
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	$ 3,718	$ 2,903
Expected timing of satisfaction	1 year	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	$ 731	$ 98
Expected timing of satisfaction	1 year
Subscription license | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 7,215
Expected timing of satisfaction
Perpetual license
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 317	$ 2,727
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
Expected timing of satisfaction		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	$ 317	$ 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	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	$ 0
Expected timing of satisfaction	1 year
Perpetual license | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 0
Expected timing of satisfaction
Consulting
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 47,807	$ 38,748
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
Expected timing of satisfaction		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	$ 45,320	$ 1,604
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	$ 2,291	$ 2,428
Expected timing of satisfaction	1 year	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	$ 144	$ 0
Expected timing of satisfaction	1 year
Consulting | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-04-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 52
Expected timing of satisfaction