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New accounting pronouncements (Details) - USD ($) $ in Thousands		3 Months Ended
	Jul. 01, 2018	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of sales		$ (2,594,823)	$ (2,523,294)
Selling, general and administrative expenses		(394,322)	(396,984)
Retained earnings	$ 11,630,756	$ 11,902,300		$ 11,625,975
Accounting Standards Update 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of sales			9,584
Selling, general and administrative expenses			$ 4,687
Accounting Standards Update 2016-16
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	(19,000)
Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	5,000
Accumulated Other Comprehensive (Loss) \| Accounting Standards Update 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity Securities, FV-NI, Unrealized Gain	(2,000)
Retained Earnings \| Accounting Standards Update 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity Securities, FV-NI, Unrealized Gain	$ 2,000