Revenue - Summary of Net Sales by Product Type (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 896,126	$ 772,408	$ 870,943	$ 799,804	$ 854,234	$ 743,499	$ 931,509	$ 971,118	$ 3,339,281	$ 3,500,360	$ 3,360,492
Server and storage systems
Disaggregation of Revenue [Line Items]
Net sales									2,620,754	2,858,644	2,663,580
Subsystems and accessories
Disaggregation of Revenue [Line Items]
Net sales									$ 718,527	$ 641,716	$ 696,912