401(k) PLAN (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jun. 30, 2012 Y	Jun. 30, 2011	Jun. 30, 2010
401(k) PLAN
Maximum percentage of compensation the plan participants may defer	25.00%
Percentage of employer contribution of first 6 percent of eligible compensation deferred by employee	50.00%
Maximum percentage eligible compensation, 50% matched	6.00%
Matching contributions made by the employer	$ 2.2	$ 1.9	$ 1.9
Percentage of employer contribution vested immediately for employees hired through December 31, 2000	100.00%
Percentage of employer contribution vesting annually for employees hired on or after January 1, 2001	20.00%
Vesting period of employer match, for employees hired on or after January 1, 2001 (in years)	5
Percentage of employer contribution vesting annually for employees effective October 1, 2005	25.00%
Vesting period of employer match, effective October 1, 2005 (in years)	4