Financial Instruments - Contractual maturities of available-for-sale investments (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
Available-for-sale Securities, Debt Maturities [Abstract]
Less than one year, amortized cost	$ 690	$ 29,960
Less than one year, fair value	693	29,990
One to three years, amortized cost	7,865	144,100
One to three years, fair value	7,924	144,625
Over three years, amortized cost	2,108	34,276
Over three years, fair value	$ 2,113	$ 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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- References

No definition available.

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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

+ Details

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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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