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Summary of Total Interest Expense Recognized (Detail) - 0.25% Convertible Senior Note Due 2022 - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
0.25% contractual coupon	$ 221	$ 219	$ 441	$ 297
Amortization of debt discount and debt issuance costs including initial purchaser discount	3,145	2,935	6,255	4,043
Interest expense	$ 3,366	$ 3,154	$ 6,696	$ 4,340

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

+ References

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-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.

+ References

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