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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Income Statement [Abstract]      
Revenue $ 450,920 $ 421,553 $ 383,337
Cost of goods sold 335,542 309,625 291,516
Gross profit 115,378 111,928 91,821
Operating expenses:      
Research and development 46,431 37,344 29,835
Selling, general and administrative 75,967 66,164 48,842
Total operating expenses 122,398 103,508 78,677
Operating income (loss) (7,020) 8,420 13,144
Interest income and other income (loss), net 543 (1,943) (141)
Interest expense (6,905) (821) (91)
Net income (loss) before income taxes (13,382) 5,656 12,912
Income tax expense 1,256 708 3,652
Net income (loss) including noncontrolling interest (14,638) 4,948 9,260
Net loss attributable to noncontrolling interest (16,499) (9,315) (4,569)
Net income attributable to Alpha and Omega Semiconductor Limited $ 1,861 $ 14,263 $ 13,829
Net income per common share attributable to Alpha and Omega Semiconductor Limited      
Basic (in dollars per share) $ 0.08 $ 0.60 $ 0.59
Diluted (in dollars per share) $ 0.08 $ 0.57 $ 0.56
Weighted average number of common share attributable to Alpha and Omega Semiconductor Limited used to compute net income per share:      
Basic (in shares) 24,063 23,901 23,526
Diluted (in shares) 24,698 24,844 24,826