Schedule I - Condensed Unconsolidated Balance Sheets (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Current assets:
Cash and cash equivalents	$ 158,536	$ 121,893
Other current assets	8,807	37,102
Total current assets	318,333	295,298
Property, plant and equipment, net	412,340	409,737
Other long-term assets	5,804	10,617
Total assets	792,939	739,394
Current liabilities:
Total liabilities	361,051	296,105
Preferred shares, par value $0.002 per share:
Authorized: 10,000 shares; issued and outstanding: none at June 30, 2020 and 2019	0	0
Common shares, par value $0.002 per share:
Authorized: 100,000 shares; issued and outstanding: 31,944 shares and 25,305 shares, respectively at June 30, 2020 and 31,163 shares and 24,517 shares, respectively at June 30, 2019	64	62
Treasury shares at cost; 6,639 shares at June 30, 2020 and 6,646 shares at June 30, 2019	(66,184)	(66,240)
Additional paid-in capital	246,103	234,410
Accumulated other comprehensive loss	(5,127)	(2,693)
Retained earnings	118,833	125,485
Total Alpha and Omega Semiconductor Limited shareholder's equity	293,689	291,024
Noncontrolling interest	138,199	152,265
Total equity	431,888	443,289	$ 426,162	$ 298,549
Total liabilities and equity	792,939	739,394
Parent Company
Current assets:
Cash and cash equivalents	4,538	5,284
Accounts receivable - Intercompany	0	0
Other current assets	220	325
Total current assets	4,758	5,609
Property, plant and equipment, net	44	119
Other long-term assets	160	242
Investment in subsidiaries	446,415	459,696
Total assets	451,377	465,666
Current liabilities:
Accounts payable and accrued liabilities	4,816	863
Accounts payable - Intercompany	14,673	21,514
Total liabilities	19,489	22,377
Preferred shares, par value $0.002 per share:
Authorized: 10,000 shares; issued and outstanding: none at June 30, 2020 and 2019	0	0
Common shares, par value $0.002 per share:
Authorized: 100,000 shares; issued and outstanding: 31,944 shares and 25,305 shares, respectively at June 30, 2020 and 31,163 shares and 24,517 shares, respectively at June 30, 2019	64	62
Treasury shares at cost; 6,639 shares at June 30, 2020 and 6,646 shares at June 30, 2019	(66,184)	(66,240)
Additional paid-in capital	246,103	234,410
Accumulated other comprehensive loss	(5,127)	(2,693)
Retained earnings	118,833	125,485
Total Alpha and Omega Semiconductor Limited shareholder's equity	293,689	291,024
Noncontrolling interest	138,199	152,265
Total equity	431,888	443,289
Total liabilities and equity	$ 451,377	$ 465,666