Long-term Debt - Summary of long-term debt (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Jun. 30, 2013
Debt Instrument [Line Items]
Principal amount of long-term debt	$ 1,321,250	$ 611,250
Less unamortized discount	(1,176)	(11,421)
Less unamortized debt issuance costs	(5,547)	(3,522)
Total long-term debt	1,314,527	596,307
Less current portion	(51,953)	(295,517)
Long-term debt, net of current portion	1,262,574	300,790
Convertible notes payable
Debt Instrument [Line Items]
Principal amount of long-term debt	300,000	300,000
Bank credit facility - Term Loan
Debt Instrument [Line Items]
Principal amount of long-term debt	831,250	131,250
Bank credit facility - Revolving Facility
Debt Instrument [Line Items]
Principal amount of long-term debt	$ 190,000	$ 180,000