SIGNIFICANT ACCOUNTING POLICIES (Net Earnings (Loss) Per Share) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2016
Numerator:
Net income	$ 25,381	$ 128,046	$ 84,172	$ 76,609
Net income attributable to Non-controlling interests		787
Net income attributable to SolarEdge Technologies Inc.	$ 25,381	$ 128,833	$ 84,172	$ 76,609
Denominator:
Shares used in computing net earnings per share of common stock, basic	41,026,926	45,235,310	42,209,238	39,987,935
Effect of stock-based awards	2,812,416	2,744,692	3,216,069	4,388,140
Shares used in computing net earnings per share of common stock, diluted	43,839,342	47,980,002	45,425,307	44,376,075