Investments - Summary of Gross Unrealized Losses and Fair Values of Available-For-Sale Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Jun. 30, 2014
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Available-for-sale securities, Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value	$ 1,219	$ 1,776
Available-for-sale securities, Continuous Unrealized Loss Position, 12 Months or Greater, Fair Value	285	0
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	1,504	1,776
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Available-for-sale securities, Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses	(941)	(80)
Available-for-sale securities, Continuous Unrealized Loss Position, 12 Months or Greater, Gross Unrealized Losses	(33)	0
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total	(974)	(80)
Common stock - Domestic [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Available-for-sale securities, Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value	77	125
Available-for-sale securities, Continuous Unrealized Loss Position, 12 Months or Greater, Fair Value	107	0
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	184	125
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Available-for-sale securities, Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses	(7)	(3)
Available-for-sale securities, Continuous Unrealized Loss Position, 12 Months or Greater, Gross Unrealized Losses	(2)	0
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total	(9)	(3)
Common stock - International [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Available-for-sale securities, Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value	114
Available-for-sale securities, Continuous Unrealized Loss Position, 12 Months or Greater, Fair Value	39
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	153
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Available-for-sale securities, Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses	(23)
Available-for-sale securities, Continuous Unrealized Loss Position, 12 Months or Greater, Gross Unrealized Losses	(16)
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total	(39)
Corporate debt [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Available-for-sale securities, Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value	386	1,382
Available-for-sale securities, Continuous Unrealized Loss Position, 12 Months or Greater, Fair Value	0	0
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	386	1,382
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Available-for-sale securities, Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses	(817)	(74)
Available-for-sale securities, Continuous Unrealized Loss Position, 12 Months or Greater, Gross Unrealized Losses	0	0
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total	(817)	(74)
Mutual funds - Fixed income [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Available-for-sale securities, Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value	67	151
Available-for-sale securities, Continuous Unrealized Loss Position, 12 Months or Greater, Fair Value	139	0
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	206	151
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Available-for-sale securities, Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses	(7)	(2)
Available-for-sale securities, Continuous Unrealized Loss Position, 12 Months or Greater, Gross Unrealized Losses	(15)	0
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total	(22)	(2)
Mutual funds - Domestic equity [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Available-for-sale securities, Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value	463
Available-for-sale securities, Continuous Unrealized Loss Position, 12 Months or Greater, Fair Value	0
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	463
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Available-for-sale securities, Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses	(80)
Available-for-sale securities, Continuous Unrealized Loss Position, 12 Months or Greater, Gross Unrealized Losses	0
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total	(80)
Other [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Available-for-sale securities, Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value	112	118
Available-for-sale securities, Continuous Unrealized Loss Position, 12 Months or Greater, Fair Value	0	0
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	112	118
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Available-for-sale securities, Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses	(7)	(1)
Available-for-sale securities, Continuous Unrealized Loss Position, 12 Months or Greater, Gross Unrealized Losses	0	0
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total	$ (7)	$ (1)