Earnings Per Share - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Restricted Shares and Restricted Stock Units [Member]	Dec. 31, 2012 Restricted Shares and Restricted Stock Units [Member]	Dec. 31, 2013 Restricted Shares and Restricted Stock Units [Member]	Dec. 31, 2012 Restricted Shares and Restricted Stock Units [Member]	Dec. 31, 2013 Convertible Senior Notes [Member]	Oct. 31, 2012 Convertible Senior Notes [Member]
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Common stock outstanding and not included in the computation of diluted earnings per share	943,458	1,642,862	1,014,125	1,542,575	0	0	177,489	59,352
Convertible Senior Notes, outstanding										$ 400,000,000
Convertible Senior Notes, interest rate										1.25%
Convertible Senior Notes, maturity									Oct. 15, 2012
Initial conversion price of the Convertible Senior Notes, per share	$ 104		$ 104
Amount of Convertible Senior Notes			$ 1,000						$ 1,000