Debt (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended				0 Months Ended	9 Months Ended				9 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011	Oct. 21, 2011	Jun. 30, 2011	Mar. 31, 2012 Convertible Senior Notes [Member]	Mar. 31, 2012 Convertible Senior Notes [Member]	Jun. 30, 2011 Convertible Senior Notes [Member]	Mar. 31, 2012 Revolving Credit Facility [Member]	Jun. 30, 2011 Revolving Credit Facility [Member]	Mar. 31, 2012 Guarantee And Collateral Agreement [Member]	Jun. 30, 2011 Guarantee And Collateral Agreement [Member]
Debt Instrument [Line Items]
Short-term borrowings outstanding	$ 246,000		$ 246,000			$ 1,785,000
Lines of credit	18,600,000		18,600,000			20,800,000
Debt instrument, maturity date								Oct. 15, 2012				Dec. 01, 2015
Borrowings under the Credit Agreement	0		0			0
Amount of outstanding letters of credit										8,500,000	7,300,000	8,500,000	7,300,000
Unused available credit										541,500,000	542,700,000
Unamortized balance of debt issuance costs	400,000		400,000			1,100,000				7,000,000
Convertible Senior Notes outstanding							400,000,000	400,000,000	400,000,000
Debt instrument, issuance date			October 23, 2007
Interest rate on notes	0.25%		0.25%				1.25%	1.25%
Initial conversion rate on the Convertible Senior Notes, in shares			9.6154
Principal amount of Convertible Senior Notes			1,000
Initial conversion price per share	$ 104		$ 104
Effective interest rate, Convertible Senior Notes			5.60%
Proceeds received attributed to conversion feature of Convertible Senior Notes			75,700,000
Additional paid-in capital representing the equity component of the Convertible Senior Notes			48,300,000
Convertible Senior Notes, interest expense	1,300,000	1,300,000	3,800,000	3,800,000
Noncash interest expense	4,100,000	3,900,000	12,500,000	11,800,000
Amortization of discount, Convertible Senior Notes	200,000	200,000	600,000	600,000
Debt issuance costs for revolving credit facility			$ 0	$ 7,002,000				$ 4,800,000
Fair Value Assumptions, Expected Term							7M
Number of business days to file registration statement					7