Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

Name:	us-gaap_DerivativeLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Summary by Level of Fair Value of Financial Instruments Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Jun. 30, 2017
Liabilities:
Convertible notes fair value	$ 406,203
Fair Value, Inputs, Level 3
Liabilities:
Contingent earnout arrangements	7,021	$ 7,429
Fair Value, Measurements, Recurring
Assets:
Foreign currency forward contracts	387		$ 121
Liabilities:
Net put option	2,024		2,024
Contingent earnout arrangements	4,997		5,405
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2
Assets:
Foreign currency forward contracts	387		121
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 3
Liabilities:
Net put option	2,024		2,024
Contingent earnout arrangements	$ 4,997		$ 5,405