EARNINGS PER SHARE (Schedule of Computation of Basic and Diluted Net Earnings (Loss) Per Share) (Details) - USD ($) $ in Thousands		3 Months Ended						9 Months Ended
		Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator:
Net income		$ 43,751			$ 41,724			$ 122,667	$ 92,612
Net (income) loss attributable to Non-controlling interests					(97)				1,159
Net income attributable to SolarEdge Technologies, Inc.		$ 43,751	$ 36,668	$ 42,248	$ 41,627	$ 33,128	$ 19,016	$ 122,667	$ 93,771
Denominator:
Shares used in computing net earnings per share of common stock, basic		50,529,691			48,195,020			49,842,399	47,637,023
Numerator:
Net income		$ 43,751			$ 41,724			$ 122,667	$ 92,612
Notes due 2025	[1]	137						137
Net (income) loss attributable to Non-controlling interests					(97)				1,159
Undistributed earnings reallocated to non-vested stockholders					(270)				(569)
Net income attributable to SolarEdge Technologies, Inc.		$ 43,888			$ 41,357			$ 122,804	$ 93,202
Denominator:
Shares used in computing net earnings per share of common stock, basic		50,529,691			48,195,020			49,842,399	47,637,023
Weighted average effect of dilutive securities:
Non-vested PSUs					(334,096)				(304,725)
Notes due 2025	[1]	197,984			3,220,670			65,995	2,603,340
Effect of stock-based awards		2,416,513						2,715,281
Shares used in computing net earnings per share of common stock, diluted		53,144,188			51,081,594			52,623,675	49,935,638

[1] See Note 8 for additional details.