Net Income Per Common Share - Narrative (Detail) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share Disclosure [Line Items]
Common equivalent shares outstanding excluded from calculation of diluted income per common share because their effect would have been anti-dilutive	565	1,685	576	1,732