New accounting pronouncements (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Jul. 01, 2018	Jun. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of sales	$ (2,766,744)	$ (2,819,804)	$ (7,963,906)	$ (7,907,547)
Selling, general and administrative expenses	(360,865)	$ (416,457)	(1,152,446)	$ (1,221,779)
Impact of adoption of accounting standards						$ (251)
Accounting Standards Update 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of sales	5,204		19,409
Selling, general and administrative expenses	$ 4,138		$ 12,950
Accounting Standards Update 2016-16
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact of adoption of accounting standards					$ (19,000)
Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact of adoption of accounting standards					5,000
Accumulated Other Comprehensive (Loss)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact of adoption of accounting standards						(1,734)
Accumulated Other Comprehensive (Loss) | Accounting Standards Update 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact of adoption of accounting standards					(2,000)
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact of adoption of accounting standards						$ 1,483
Retained Earnings | Accounting Standards Update 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact of adoption of accounting standards					$ 2,000