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Segment Reporting - Segment Reporting of Net Sales by Product Type (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2012
Segment Reporting Information [Line Items]                      
Net sales $ 428,069 $ 373,755 $ 356,362 $ 309,016 $ 322,333 $ 278,034 $ 291,487 $ 270,707 $ 1,467,202 $ 1,162,561 $ 1,013,874
Net Sales [Member]
                      
Segment Reporting Information [Line Items]                      
Percent of net sales                 100.00% 100.00% 100.00%
Net Sales [Member] | Customer Concentration Risk [Member]
                      
Segment Reporting Information [Line Items]                      
Concentration, number of customers                 0 0 0
Accounts Receivable [Member] | Credit Concentration Risk [Member]
                      
Segment Reporting Information [Line Items]                      
Concentration, number of customers                 0 1  
Accounts Receivable [Member] | One Customer [Member] | Credit Concentration Risk [Member]
                      
Segment Reporting Information [Line Items]                      
Percent of net sales                   14.40%  
Server systems [Member]
                      
Segment Reporting Information [Line Items]                      
Net sales                 740,789 501,868 447,000
Server systems [Member] | Net Sales [Member]
                      
Segment Reporting Information [Line Items]                      
Percent of net sales                 50.50% 43.20% 44.10%
Subsystems and accessories [Member]
                      
Segment Reporting Information [Line Items]                      
Net sales                 $ 726,413 $ 660,693 $ 566,874
Subsystems and accessories [Member] | Net Sales [Member]
                      
Segment Reporting Information [Line Items]                      
Percent of net sales                 49.50% 56.80% 55.90%