Stock Incentive Plan and Employee Stock Purchase Plan - Schedule of Assumptions Used for Determining Fair Value of Stock Options (Parenthetical) (Details) - shares	12 Months Ended
Jun. 30, 2018	Jun. 30, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock options issued	0	0

Gross number of share options (or share units) granted during the period.

No definition available.

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration