Summary of Total Interest Expense Recognized (Detail) - USD ($) $ in Thousands	3 Months Ended
Sep. 30, 2019	Sep. 30, 2018
Debt Instrument [Line Items]
Amortization of discount on convertible debt and debt issuance costs	$ 3,570	$ 3,110
0.25% Convertible Senior Note Due 2022
Debt Instrument [Line Items]
0.25% contractual coupon	220	220
Amortization of discount on convertible debt and debt issuance costs	3,255	3,110
Interest expense	$ 3,475	$ 3,330

Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of the cost of borrowed funds accounted for as interest expense for debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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