Long-term Debt (Details) (USD $)	12 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2009
Principal payments on debt due in succeeding fiscal years [Abstract]
2012	$ 50,000,000
2013	70,000,000
2014	50,000,000
2015	25,000,000
2016	0
Total long-term debt	195,000,000	300,000,000
Current portion of long-term debt	(50,000,000)	(50,000,000)
Long-term debt	145,000,000	250,000,000
Subordinated note interest rate	3.25%
Covenant requirement, maximum ratio of debt to trailing 12 month EBITDA	3.75
Covenant actual, ratio of debt to trailing 12 month EBITDA	0.8
Covenant requirement, minimum ratio of EBITDA to interest expense	2.75
Covenant actual, ratio of EBITDA to Interest Expense	20.4
Interest expense related to long-term debt	11,900,000	17,300,000	20,200,000
Maximum [Member] | Line of Credit [Member] | Asset-backed Bank Facility [Member]
Principal payments on debt due in succeeding fiscal years [Abstract]
Commitment fee percentage	0.475%
Maximum [Member] | Line of Credit [Member] | Revolving Credit Facility [Member]
Principal payments on debt due in succeeding fiscal years [Abstract]
Commitment fee percentage	0.625%
Line of Credit [Member] | Asset-backed Bank Facility [Member]
Principal payments on debt due in succeeding fiscal years [Abstract]
Total long-term debt	70,000,000	75,000,000
Accounts receivable net of reserves oustanding under revolving agreement	147,800,000
Asset-backed bank facility weighted average effective interest rate	1.23%
Credit facility remainining borrowing capacity	30,000,000
Line of Credit [Member] | Asset-backed Bank Facility [Member] | Minimum [Member]
Principal payments on debt due in succeeding fiscal years [Abstract]
Commitment fee percentage	0.425%
Line of Credit [Member] | Revolving Credit Facility [Member]
Principal payments on debt due in succeeding fiscal years [Abstract]
Total long-term debt	0	50,000,000
Amount outstanding	0
Credit facility remainining borrowing capacity	150,000,000
Additional borrowing capacity available under credit facility	150,000,000
Line of Credit [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Principal payments on debt due in succeeding fiscal years [Abstract]
Commitment fee percentage	0.25%
Senior Notes [Member]
Principal payments on debt due in succeeding fiscal years [Abstract]
Private placement notes interest rate, minimum	5.04%
Private placement notes interest rate, maximum	7.19%
Private placement notes weighted average interest rate	6.13%
Senior Notes [Member] | Senior Notes 4.70% Due 6/16/2011 [Member]
Principal payments on debt due in succeeding fiscal years [Abstract]
Total long-term debt	0	50,000,000
Private placement notes interest rate	4.70%
Senior Notes [Member] | Senior Notes 5.04% Due 6/16/2012 [Member]
Principal payments on debt due in succeeding fiscal years [Abstract]
Total long-term debt	50,000,000	50,000,000
Private placement notes interest rate	5.04%
Senior Notes [Member] | Senior Notes 6.70% Due 7/13/2013 [Member]
Principal payments on debt due in succeeding fiscal years [Abstract]
Total long-term debt	50,000,000	50,000,000
Private placement notes interest rate	6.70%
Senior Notes [Member] | Senior Notes 7.19% Due 7/13/2014 [Member]
Principal payments on debt due in succeeding fiscal years [Abstract]
Total long-term debt	$ 25,000,000	$ 25,000,000
Private placement notes interest rate	7.19%