Financial instruments - Fair value of derivative instruments reported in consolidated balance sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jun. 30, 2019
Cross-currency swap contracts \| Other assets
Derivatives, Fair Value [Line Items]
Net investment hedge, assets	$ 32,485	$ 24,545
Forward exchange contracts \| Non-trade and notes receivable
Derivatives, Fair Value [Line Items]
Cash flow hedge, assets	16,663	13,242
Forward exchange contracts \| Other accrued liabilities
Derivatives, Fair Value [Line Items]
Cash flow hedge, liability	1,450	2,578
Costless collar contracts \| Non-trade and notes receivable
Derivatives, Fair Value [Line Items]
Cash flow hedge, assets	1,559	457
Costless collar contracts \| Other accrued liabilities
Derivatives, Fair Value [Line Items]
Cash flow hedge, liability	$ 2,857	$ 1,934

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

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