REVENUE - Schedule of System Revenues of Primary Markets (Details) - Systems revenue	3 Months Ended	9 Months Ended
Mar. 31, 2019	Mar. 31, 2019
Memory
Concentration Risk [Line Items]
Primary market revenue, percent	61.00%	72.00%
Foundry
Concentration Risk [Line Items]
Primary market revenue, percent	27.00%	19.00%
Logic/integrated device manufacturing
Concentration Risk [Line Items]
Primary market revenue, percent	12.00%	9.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration