Annual report pursuant to Section 13 and 15(d)

Marketable Securities - Narrative (Details)

v3.5.0.2
Marketable Securities - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
Investments, Debt and Equity Securities [Abstract]      
Investment portfolio, maximum maturity term (in years) 3 years    
Realized gains on available for sale securities $ 0.9 $ 2.4 $ 2.2