Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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+ Details

Earnings Per Share - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended			9 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012	Oct. 31, 2012 Convertible Senior Notes [Member]	Mar. 31, 2013 Restricted shares and restricted stock units [Member]	Mar. 31, 2012 Restricted shares and restricted stock units [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	1,245,003	981,637	1,339,085	1,943,917		59,161	5,000
Convertible Senior Notes, outstanding					$ 400,000,000
Convertible Senior Notes, interest rate					1.25%
Initial conversion price of the Convertible Senior Notes	$ 104		$ 104
Amount of Convertible Senior Notes			$ 1,000