Stock-Based Compensation - Additional information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	12 Months Ended							1 Months Ended	12 Months Ended
	Aug. 31, 2008	Jun. 30, 2013 CompensationPlan	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2013 Restricted Stock Units (RSUs) Employees and Consultants	Jun. 30, 2012 Restricted Stock Units (RSUs) Employees and Consultants	Jun. 30, 2011 Restricted Stock Units (RSUs) Employees and Consultants	Jun. 30, 2013 Maximum	May 31, 2010 Stock Incentive Plan 2011 Directors Stock Option Plan	Jun. 30, 2013 Stock Incentive Plan 2011 Directors Stock Option Plan	Jun. 30, 2012 Stock Incentive Plan 2011 Directors Stock Option Plan	Jun. 30, 2011 Stock Incentive Plan 2011 Directors Stock Option Plan	Jun. 30, 2013 Stock Incentive Plan Two Thousand Two	Jun. 30, 2013 Stock Incentive Plan 2003	Jun. 30, 2013 Stock Incentive Plan Two Thousand Eleven
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		$ 4.2	$ 4.6	$ 4.8
Unrecognized non-vested share based compensation cost		$ 6.7
Unrecognized non-vested share based compensation cost, expected weighted-average period of recognition		2 years
Number of stock-based incentive compensation plans		3
Common stock issuable upon exercise of awards granted													66,000	896,209	2,095,000
Common stock available for future grant															6,662,515
Stock options exercisable, weighted-average remaining contractual term		5 years
Stock options expiry term (in years)	10 years							10 years
Stock units granted on the date of initial election per person									10,000
Stock units granted per person on September 20 of each year if non-employee director had then served as a member of our Board of Directors for at least 180 days									10,000
Stock units award, requisite service period										180 days
Stock units granted					2,237,000	1,013,000	1,052,000			60,000	70,000	60,000
Stock units vesting period					4 years	4 years	4 years