Share-based Compensation - Nonvested Share Activity Rollforward (Details) - USD ($)	1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Sep. 30, 2018	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Allocated share-based compensation expense			$ 29,569,000	$ 21,641,000	$ 37,488,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted Average Remaining Recognition Period (Years)			2 years 7 months 6 days
Market-based Restricted Stock Units (MSU)
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Allocated share-based compensation expense			$ 5,000,000	$ (6,400,000)	$ 1,900,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares
Nonvested (in shares)			1,727,000	2,108,000	2,206,000
Granted (in shares)	1,000,000	1,300,000
Vested (in shares)			(270,000)	(275,000)	(90,000)
Forfeited (in shares)			(21,000)	(106,000)	(8,000)
Nonvested (in shares)			1,436,000	1,727,000	2,108,000	2,206,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Nonvested (in dollars per share)			$ 28.15	$ 25.86	$ 25.10
Vested (in dollars per share)			5.17	5.17	5.17
Forfeited (in dollars per share)			38.14	42.32	48.44
Nonvested (in dollars per share)			$ 32.32	$ 28.15	$ 25.86	$ 25.10
Weighted Average Remaining Recognition Period (Years)			2 years 10 months 20 days
Aggregate intrinsic value, nonvested			$ 36,847,760	$ 64,537,990	$ 69,142,400	$ 73,548,040
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares
Nonvested (in shares)			1,469,135	1,385,065	1,169,609
Granted (in shares)			655,738	679,993	714,080
Vested (in shares)			(574,664)	(521,109)	(451,549)
Forfeited (in shares)			(58,283)	(74,814)	(47,075)
Nonvested (in shares)			1,491,926	1,469,135	1,385,065	1,169,609
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Nonvested (in dollars per share)			$ 29.13	$ 32.48	$ 34.03
Granted (in dollars per share)			29.39	23.12	27.70
Vested (in dollars per share)			31.17	30.00	28.84
Forfeited (in dollars per share)			28.25	30.34	33.40
Nonvested (in dollars per share)			$ 28.50	$ 29.13	$ 32.48	$ 34.03
Weighted Average Remaining Recognition Period (Years)			1 year 7 months 28 days
Aggregate intrinsic value, nonvested			$ 38,282,821	$ 54,901,575	$ 45,430,132	$ 38,994,764
Performance Based Restricted Stock Units (PRSUs)
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Allocated share-based compensation expense			$ 4,000,000.0	$ 2,800,000	$ 5,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares
Nonvested (in shares)			344,125	526,714	389,375
Granted (in shares)			209,750	209,250	264,214
Vested (in shares)			(133,910)	(123,632)	(116,132)
Forfeited (in shares)			(10,402)	(268,207)	(10,743)
Nonvested (in shares)			409,563	344,125	526,714	389,375
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Nonvested (in dollars per share)			$ 30.69	$ 32.19	$ 36.56
Granted (in dollars per share)			27.61	21.55	25.70
Vested (in dollars per share)			33.60	30.50	30.54
Forfeited (in dollars per share)			48.65	26.59	48.65
Nonvested (in dollars per share)			$ 27.71	$ 30.69	$ 32.19	$ 36.56
Weighted Average Remaining Recognition Period (Years)			1 year 10 months 6 days
Aggregate intrinsic value, nonvested			$ 10,509,387	$ 12,859,951	$ 17,276,219	$ 12,981,763

ALPHA & OMEGA SEMICONDUCTOR Ltd 10-K