Share-based Compensation - Rollforward (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Employee Stock Purchase Plan
Aggregate number of shares authorized for issuance	8,100
Restricted stock
Stock Options and Restricted Stock
Annual forfeiture rate used to calculate compensation expense (as a percent)	6.50%	6.50%
Awards
Nonvested at the beginning of the period (in shares)	98
Granted (in shares)	131
Vested (in shares)	(57)
Forfeited (in shares)	(2)
Nonvested at the end of the period (in shares)	170
Weighted Average Grant-date Fair Value
Nonvested at the beginning of the period (in dollars per share)	$ 37.83
Granted (in dollars per share)	58.06
Vested (in dollars per share)	46.87
Forfeited (in dollars per share)	46.22
Nonvested at the end of the period (in dollars per share)	$ 50.31
Aggregate Intrinsic Value
Vested	$ 3,302
Employee stock purchase plan
Employee Stock Purchase Plan
Purchase price lower of the fair market value of the common stock on the first day of the calendar quarter or the last day of the calendar quarter (as a percent)	85.00%
Percentage of the compensation authorized by the employee to be withheld	10.00%
Aggregate number of shares authorized for issuance	1,100
Shares issued under the ESPP (in shares)	11	6
Cumulative shares issued under the ESPP (in shares)	449