Retirement Plans - Narrative (Details) - USD ($)	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
401(k) Savings Plan
Defined Benefit Plan Disclosure [Line Items]
Company's discretionary contributions	$ 0	$ 0	$ 0
Super Micro Computer, B.V.
Defined Benefit Plan Disclosure [Line Items]
Company's discretionary contributions	600,000	500,000	500,000
Super Micro Computer, Taiwan | Pension Plan | Super Micro Computer, Taiwan Defined Benefit Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Company's contribution costs	$ 2,000,000.0	$ 1,600,000	$ 1,500,000