ACQUISITION - Pro Forma Nonrecurring Adjustments (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Weighted average number of common shares outstanding:
Basic (in shares)	64,154,252	64,096,778	63,664,256	60,096,852	60,065,978	60,065,053	60,059,936	60,053,912	62,980,193	60,061,243	51,840,518
Diluted (in shares)	64,154,252	64,096,778	63,664,256	60,096,852	60,065,978	60,065,053	60,059,936	60,053,912	62,980,193	60,061,243	51,840,518
Cantaloupe
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenue											$ 140,575	$ 121,373
Net loss attributable to USAT											(7,256)	(13,828)
Net loss attributable to USAT common shares											$ (7,924)	$ (14,496)
Net loss per share:
Basic (in dollars per share)											$ (0.15)	$ (0.27)
Diluted (in dollars per share)											$ (0.15)	$ (0.27)
Weighted average number of common shares outstanding:
Basic (in shares)											53,717,133	52,849,217
Diluted (in shares)											53,717,133	52,849,217