Net Income Per Common Share (Narrative) (Detail) shares in Thousands	3 Months Ended	6 Months Ended
	Dec. 31, 2016 $ / shares shares	Dec. 31, 2016 $ / shares shares
Earnings Per Share [Abstract]
Number of shares excluded from diluted weighted average shares outstanding	342
Number of shares issued in connection with acquisition of Citron and Lucid	5,122	5,122
Senior notes, initial conversion price per share | $ / shares	$ 33.215	$ 33.215