Summary of Total Interest Expense Recognized (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Amortization of discount on convertible debt and debt issuance costs			$ 9,639	$ 6,255
0.25% Convertible Senior Note Due 2022
Debt Instrument [Line Items]
0.25% contractual coupon	$ 221	$ 221	441	441
Amortization of discount on convertible debt and debt issuance costs	3,291	3,145	6,546	6,255
Interest expense	$ 3,512	$ 3,366	$ 6,987	$ 6,696

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
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-Section 45
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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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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