Fair Value of Financial Instruments - Summary of financial assets and liabilities measured at fair value on a recurring basis and fair value hierarchy (Details) - Fair Value, Measurements, Recurring - Other long-term liabilities - USD ($) $ in Thousands	Mar. 31, 2016	Jun. 30, 2015
Level 3 | Contingent Consideration
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration	$ 15,707
Level 2 | Interest Rate Swap Agreements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap agreements	$ 16,317	$ 11,728