Credit Arrangements (Details) (USD $)	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Line of credit facility maximum interest rate per annum	1.75%
Accelerated financing fees from extinguishment of previous debt obligations		$ 1,100,000
Commitment fee on revolving loan unused amount, percentage	0.40%
Principal amount of debt hedged with an interest rate swap agreement	100,000,000
Interest rate swap, average interest rate	1.30%
Notional Amount of Interest Rate Derivatives	50,000,000
Derivative, Cap Interest Rate	2.00%
Interest rate on borrowing	1.90%
Gross over draft related balance related to pooling arrangement	63,400,000	50,200,000
Debt Instrument, Periodic Payment, Principal	5,000,000
Debt obligations (principal), FY 2013	5,003,000
Debt obligations (principal), FY 2014	10,000,000
Debt obligations (principal), FY 2015	20,000,000
Debt obligations (principal), FY 2016	185,000,000
Revolving Credit Facility [Member]
Line of credit facility amount outstanding	125,000,000
2011 Credit Agreement [Member] | Revolving Credit Facility [Member]
Credit agreement maximum borrowing capacity	300,000,000
Remaining borrowing available under revolving credit facility	175,000,000
2011 Credit Agreement [Member] | Term Loan [Member]
Credit agreement maximum borrowing capacity	100,000,000
Line of credit facility amount outstanding	95,000,000
2010 Credit Facility [Member]
Credit agreement maximum borrowing capacity	75,000,000
2008 Credit Facility [Member]
Credit agreement maximum borrowing capacity	315,000,000
2008 Credit Facility [Member] | Revolving Credit Facility [Member]
Credit agreement maximum borrowing capacity	165,000,000
2008 Credit Facility [Member] | Term Loan [Member]
Credit agreement maximum borrowing capacity	150,000,000
JPMorganLOC [Member]
Credit agreement maximum borrowing capacity	4,500,000
Remaining borrowing available under revolving credit facility	4,500,000
RBSLOC [Member]
Credit agreement maximum borrowing capacity	5,000,000
Remaining borrowing available under revolving credit facility	5,000,000
Maximum [Member] | JPMorganLOC [Member]
Interest rate on borrowing	4.00%
Maximum [Member] | RBSLOC [Member]
Interest rate on borrowing	4.00%
Minimum [Member]
Debt obligations (principal), FY 2013	5,000,000
Debt obligations (principal), FY 2014	10,000,000
Debt obligations (principal), FY 2015	20,000,000
Debt obligations (principal), FY 2016	$ 60,000,000
Minimum [Member] | JPMorganLOC [Member]
Interest rate on borrowing	2.00%
Minimum [Member] | RBSLOC [Member]
Interest rate on borrowing	2.00%