Summary of Significant Accounting Policies - Net Earnings Per Share Additional Information (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	0 Months Ended	12 Months Ended
	Feb. 16, 2011	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Accounting Policies [Abstract]
Common stock excluded from diluted earning per share (in shares)		1,485	1,244	753
Class of Stock [Line Items]
Follow-on public stock offering, price per share (in usd per share)	$ 17.75
Proceeds from follow-on public stock offering, net	$ 93,605	$ 0	$ 0	$ 93,605
Follow-on public stock offering weighted average share included in basic and diluted earning per share (in shares)		5,578	5,578	2,129
Common Stock
Class of Stock [Line Items]
Follow-on public stock offering (in shares)	5,578