Equity Based Performance Units Activity (Detail) (Performance Awards, USD $)	12 Months Ended
	Jun. 30, 2013
Performance Awards
Equity-based Performance Units
Nonvested balance at June 30, 2012	400,000
Granted	300,000
Vested	0
Forfeited	(100,000)
Nonvested balance at June 30, 2013	587,272
Weighted Average Grant-Date Fair Value
Nonvested balance at June 30, 2012	$ 29.52	[1]
Granted	$ 17.27	[1]
Vested	$ 0.0	[1]
Forfeited	$ 41.55	[1]
Nonvested balance at June 30, 2013	$ 21.62	[1]

[1] For equity-based performance units, grant-date fair value is equal to the closing market price of a share of our common stock on the grant date.