Financial instruments - Summary of the location and fair value of derivative financial instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018
Cross-currency swap contracts \| Other assets
Derivatives, Fair Value
Net investment hedge, assets	$ 9,598	$ 7,614
Costless collar contracts \| Non-trade and notes receivable
Derivatives, Fair Value
Cash flow hedge, assets	1,125	932
Costless collar contracts \| Other accrued liabilities
Derivatives, Fair Value
Cash flow hedge, liability	$ 2,777	$ 236

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959

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- Definition

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

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- Definition

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- Definition

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

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