Share-Based Compensation - Summary of Director Stock Units Activity (Details) - Non-employee Board of Director's Plan - $ / shares	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Number of Units
Balance at the beginning of the period (in shares)	287,436	269,315	246,519
Granted (in shares)	40,323	24,668	19,770
Distributed (in shares)		(11,296)
Dividend equivalents (in shares)	7,184	4,749	3,026
Balance at the end of the period (in shares)	334,943	287,436	269,315
Weighted Average Grant Date Fair Value
Balance at the beginning of the period (in dollars per share)	$ 35.48	$ 32.25	$ 30.06
Granted (in dollars per share)	32.54	42.80	59.47
Distributed (in dollars per share)		31.79
Dividend equivalents (in dollars per share)	0.00	0.00	0.00
Balance at the end of the period (in dollars per share)	$ 38.64	$ 35.48	$ 32.25