REVENUE - Performance Obligations (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 817,179	$ 628,289
Revenue remaining performance obligation, percentage	100.00%	100.00%
1 year or less
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 461,398	$ 360,323
Revenue remaining performance obligation, percentage	57.00%	57.00%
1-2 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 190,886	$ 117,907
Revenue remaining performance obligation, percentage	23.00%	19.00%
2-3 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 116,035	$ 83,803
Revenue remaining performance obligation, percentage	14.00%	13.00%
Greater than 3 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 48,860	$ 66,256
Revenue remaining performance obligation, percentage	6.00%	11.00%
Perpetual license
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 9,820	$ 10,650
Perpetual license | 1 year or less
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	8,120	8,429
Perpetual license | 1-2 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	1,700	915
Perpetual license | 2-3 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	0	1,306
Perpetual license | Greater than 3 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	0	0
Term license
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	66,843	43,584
Term license | 1 year or less
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	53,550	38,080
Term license | 1-2 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	6,187	4,678
Term license | 2-3 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	6,460	641
Term license | Greater than 3 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	646	185
Maintenance
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	257,959	194,564
Maintenance | 1 year or less
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	186,618	173,421
Maintenance | 1-2 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	40,153	12,530
Maintenance | 2-3 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	20,671	5,801
Maintenance | Greater than 3 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	10,517	2,812
Pega Cloud
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	457,391	362,063
Pega Cloud | 1 year or less
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	191,187	124,134
Pega Cloud | 1-2 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	140,860	98,842
Pega Cloud | 2-3 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	88,273	75,828
Pega Cloud | Greater than 3 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	37,071	63,259
Consulting
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	25,166	17,428
Consulting | 1 year or less
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	21,923	16,259
Consulting | 1-2 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	1,986	942
Consulting | 2-3 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	631	227
Consulting | Greater than 3 years
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 626	$ 0