Financial instruments - Available-for-Sale Investments - Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Jun. 30, 2016
Investments, All Other Investments [Abstract]
Less than one year, Amortized Cost	$ 325	$ 29,960
Less than one year, Fair Value	327	29,990
One to three years, Amortized Cost	7,870	144,100
One to three years, Fair Value	7,917	144,625
Above three years, Amortized Cost	2,018	34,276
Above three years, Fair Value	$ 2,024	$ 34,275

Available-for-sale Securities, Debt Maturities, One to Three Years, Amortized Cost Basis

No definition available.

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- Definition

Available-for-sale securities, Debt Maturities, Above Three Years, Amortized Cost Basis

+ References

No definition available.

+ Details

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- Definition

Available-for-sale securities, Debt Maturities, Above Three Years, Fair Value

+ References

No definition available.

+ Details

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- Definition

Available-for-sale securities, Debt Maturities, One to Three Years, Fair Value

+ References

No definition available.

+ Details

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- Definition

Amount after adjustments of available-for-sale debt securities at cost, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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- Definition

Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27198-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

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- References

No definition available.

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