Financial instruments - Summary of the Location and Fair Value of Derivative Financial Instruments Reported in the Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Jun. 30, 2017
Cross-currency swap contracts \| Other assets
Derivatives, Fair Value
Net investment hedge, assets	$ 0	$ 15,135
Cross-currency swap contracts \| Other liabilities
Derivatives, Fair Value
Net investment hedge, liability	516	0
Costless collar contracts \| Non-trade and notes receivable
Derivatives, Fair Value
Cash flow hedge, assets	1,142	430
Costless collar contracts \| Other accrued liabilities
Derivatives, Fair Value
Cash flow hedge, liability	$ 3,654	$ 2,027

Fair value of all asset derivatives designated as cash flow hedging instruments.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959

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Fair value of all liability derivatives designated as cash flow hedging instruments.

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Fair value of all derivative assets designated as hedges of net investment in foreign operations.

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Fair value of all derivative liabilities designated as hedges of net investment in foreign operations.

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