Goodwill and intangible assets - Additional information (Details) $ in Thousands	9 Months Ended
	Mar. 31, 2019 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible amortization expense	$ 156,527
Estimated amortization expense, year ending June 30, 2019	196,201
Estimated amortization expense, year ending June 30, 2020	185,541
Estimated amortization expense, year ending June 30, 2021	180,945
Estimated amortization expense, year ending June 30, 2022	175,094
Estimated amortization expense, year ending June 30, 2023	$ 167,601