CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Total AOS Shareholders' Equity	Common Shares	Treasury Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, including portion attributable to noncontrolling interest	$ 443,289
Beginning balance at Jun. 30, 2019		$ 291,024	$ 62	$ (66,240)	$ 234,410	$ (2,693)	$ 125,485
Beginning balance, noncontrolling interest at Jun. 30, 2019								$ 152,265
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of common stock options and release of restricted stock units (in shares)			0
Exercise of common stock options and release of restricted stock units	26	26			26
Beginning balance, including portion attributable to noncontrolling interest	429,729
Reissuance of treasury stock upon exercise of common stock options and release of restricted stock units	0	0		56			(56)
Withholding tax on restricted stock units	(1,398)	(1,398)			(1,398)
Issuance of shares under ESPP (in shares)			1
Issuance of shares under ESPP	1,701	1,701			1,700
Share-based compensation	7,732	7,732			7,732
Net loss	(6,491)	(6,491)					(6,491)
Net loss attributable to noncontrolling interest	(9,826)							(9,826)
Net loss including noncontrolling interest	(16,317)
Cumulative translation adjustment		(2,715)				(2,715)
Cumulative translation adjustment, attributable to noncontrolling interest								(2,589)
Cumulative translation adjustment, including portion attributable to noncontrolling interest	(5,304)
Ending balance at Mar. 31, 2020		289,879	$ 63	(66,184)	242,470	(5,408)	118,938
Ending balance, noncontrolling interest at Mar. 31, 2020								139,850
Ending balance, including portion attributable to noncontrolling interest at Mar. 31, 2020	429,729
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, including portion attributable to noncontrolling interest	440,150
Beginning balance at Dec. 31, 2019		295,870	63	(66,227)	240,797	(4,239)	125,476
Beginning balance, noncontrolling interest at Dec. 31, 2019								144,280
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, including portion attributable to noncontrolling interest	429,729
Reissuance of treasury stock upon exercise of common stock options and release of restricted stock units	0	0		43			(43)
Withholding tax on restricted stock units	(1,203)	(1,203)			(1,203)
Share-based compensation	2,876	2,876			2,876
Net loss	(6,495)	(6,495)					(6,495)
Net loss attributable to noncontrolling interest	(3,391)							(3,391)
Net loss including noncontrolling interest	(9,886)
Cumulative translation adjustment		(1,169)				(1,169)
Cumulative translation adjustment, attributable to noncontrolling interest								(1,039)
Cumulative translation adjustment, including portion attributable to noncontrolling interest	(2,208)
Ending balance at Mar. 31, 2020		289,879	63	(66,184)	242,470	(5,408)	118,938
Ending balance, noncontrolling interest at Mar. 31, 2020								139,850
Ending balance, including portion attributable to noncontrolling interest at Mar. 31, 2020	429,729
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, including portion attributable to noncontrolling interest	429,729
Beginning balance, including portion attributable to noncontrolling interest	431,888
Beginning balance at Jun. 30, 2020	293,689	293,689	$ 64	(66,184)	246,103	(5,127)	118,833
Beginning balance, noncontrolling interest at Jun. 30, 2020	138,199							138,199
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of common stock options and release of restricted stock units (in shares)			0
Exercise of common stock options and release of restricted stock units	1,624	1,624			1,624
Beginning balance, including portion attributable to noncontrolling interest	486,778
Reissuance of treasury stock upon exercise of common stock options and release of restricted stock units	66	66		120			(54)
Withholding tax on restricted stock units	(6,153)	(6,153)			(6,153)
Issuance of shares under ESPP (in shares)			1
Issuance of shares under ESPP	1,636	1,636			1,635
Share-based compensation	7,725	7,725			7,725
Restricted stock units settlement in connection with service	2,000	2,000			2,000
Net loss	38,577	38,577					38,577
Net loss attributable to noncontrolling interest	(2,303)							(2,303)
Net loss including noncontrolling interest	36,274
Cumulative translation adjustment		6,123				6,123
Cumulative translation adjustment, attributable to noncontrolling interest								5,595
Cumulative translation adjustment, including portion attributable to noncontrolling interest	11,718
Ending balance at Mar. 31, 2021	345,287	345,287	$ 65	(66,064)	252,934	996	157,356
Ending balance, noncontrolling interest at Mar. 31, 2021	141,491							141,491
Ending balance, including portion attributable to noncontrolling interest at Mar. 31, 2021	486,778
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, including portion attributable to noncontrolling interest	474,656
Beginning balance at Dec. 31, 2020		331,718	$ 65	(66,097)	254,980	1,481	141,289
Beginning balance, noncontrolling interest at Dec. 31, 2020								142,938
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of common stock options and release of restricted stock units (in shares)			0
Exercise of common stock options and release of restricted stock units	129	129			129
Beginning balance, including portion attributable to noncontrolling interest	486,778
Reissuance of treasury stock upon exercise of common stock options and release of restricted stock units	0	0		33			(33)
Withholding tax on restricted stock units	(5,200)	(5,200)			(5,200)
Share-based compensation	3,025	3,025			3,025
Net loss	16,100	16,100					16,100
Net loss attributable to noncontrolling interest	(1,133)							(1,133)
Net loss including noncontrolling interest	14,967
Cumulative translation adjustment		(485)				(485)
Cumulative translation adjustment, attributable to noncontrolling interest								(314)
Cumulative translation adjustment, including portion attributable to noncontrolling interest	(799)
Ending balance at Mar. 31, 2021	345,287	$ 345,287	$ 65	$ (66,064)	$ 252,934	$ 996	$ 157,356
Ending balance, noncontrolling interest at Mar. 31, 2021	141,491							$ 141,491
Ending balance, including portion attributable to noncontrolling interest at Mar. 31, 2021	486,778
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, including portion attributable to noncontrolling interest	$ 486,778