Segment Reporting - Net Sales by Product Type (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2016 USD ($) customer	Jun. 30, 2015 USD ($) customer	Jun. 30, 2014 USD ($) customer
Segment Reporting Information [Line Items]
Net sales	$ 524,270	$ 532,721	$ 638,964	$ 519,618	$ 573,594	$ 471,225	$ 503,014	$ 443,322	$ 2,215,573	$ 1,991,155	$ 1,467,202
Net Sales
Segment Reporting Information [Line Items]
Percent of net sales									100.00%	100.00%	100.00%
Net Sales | Customer Concentration Risk
Segment Reporting Information [Line Items]
Concentration, number of customers | customer									1	1	0
Server systems
Segment Reporting Information [Line Items]
Net sales									$ 1,525,570	$ 1,213,608	$ 740,789
Server systems | Net Sales
Segment Reporting Information [Line Items]
Percent of net sales									68.90%	60.90%	50.50%
Subsystems and accessories
Segment Reporting Information [Line Items]
Net sales									$ 690,003	$ 777,547	$ 726,413
Subsystems and accessories | Net Sales
Segment Reporting Information [Line Items]
Percent of net sales									31.10%	39.10%	49.50%
One Customer | Net Sales | Customer Concentration Risk
Segment Reporting Information [Line Items]
Percent of net sales									10.90%	10.10%