Long-Term Debt And Credit Facility Narrative (Details) (USD $)	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010	Aug. 20, 2012
Debt Disclosure [Abstract]
Aggregate principal amount of senior notes	$ 150,000,000
Senior notes term, in years	10
Senior notes maturity date	May 02, 2016
Senior notes interest percentage	5.98%
Senior notes outstanding	150,000,000	150,000,000
Revolving credit facility	400,000,000			600,000,000
Revolving credit facility expiration date	Jul. 01, 2015
Interest coverage ratio	4.00
Leverage ratio	3.50
Consolidated leverage ratio	4.0
Line Of Credit Potential Incremental Borrowing Capacity Pre-Amendment	100,000,000
Line Of Credit Potential Incremental Borrowing Capacity Post-Amendment	200,000,000
Borrowings outstanding under credit agreement	240,000,000	79,000,000
Interest Paid	$ 14,377,000	$ 11,004,000	$ 10,216,000
Minimum [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.25%
Maximum [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.45%
Eurocurrency Rate [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.25%
Eurocurrency Rate [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	3.00%
Base Rate [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.25%
Base Rate [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.00%