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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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

Equity - ATM Offering (Details) - At-The-Market Offering - USD ($)	Mar. 31, 2018	Jun. 30, 2017
Class of Stock [Line Items]
Remaining offering amount available	$ 236,100,000
Maximum
Class of Stock [Line Items]
Authorized aggregate offering price of common stock		$ 300,000,000.0