Summary of Significant Accounting Policies and New Accounting Standards (Tables)

9 Months Ended

Mar. 31, 2017

Accounting Policies [Abstract]

Schedule of Net Income per Share and Weighted Average Shares

​	Three Months						Nine Months
For the Periods Ended March 31	2017			2016			2017			2016
Net income	​	$	23,643	​	$	18,577	​	$	49,237	​	$	67,508
Weighted average number of shares – basic	​	​	39,512	​	​	39,356	​	​	39,443	​	​	39,203
Dilutive effect of stock options	​	​	547	​	​	644	​	​	545	​	​	793
Weighted average number of shares – diluted	​	​	40,059	​	​	40,000	​	​	39,988	​	​	39,996
Net income per share	​	​	​	​	​	​	​	​	​	​	​	​
basic	​	$	0.60	​	$	0.47	​	$	1.25	​	$	1.72
diluted	​	$	0.59	​	$	0.46	​	$	1.23	​	$	1.69