Debt (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Jun. 30, 2011
Debt Instrument [Line Items]
Outstanding short-term borrowings	$ 219,000		$ 219,000		$ 1,785,000
Lines of credit	17,900,000		17,900,000		20,800,000
Convertible notes, interest expense	1,300,000	1,300,000	2,500,000	2,500,000
Convertible senior notes outstanding	400,000,000		400,000,000		400,000,000
Interest rate on notes	0.25%		0.25%
Initial conversion rate on the Convertible Senior Notes, in shares			9.6154
Principal amount of Convertible Senior Notes			1,000
Effective interest rate, Convertible Senior Notes			5.60%
Proceeds received attributed to conversion feature of Convertible Senior Notes			75,700,000
Unamortized balance of debt issuance costs	600,000		600,000		1,100,000
Noncash interest expense	4,200,000	4,000,000	8,400,000	7,900,000
Amortization of discount, Convertible Senior Notes	200,000	200,000	400,000	400,000
Initial conversion price per share	$ 104		$ 104
Additional paid-in capital representing the equity component of the Convertible Senior Notes			48,300,000
Debt issuance costs for revolving credit facility			0	7,003,000
Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date			Oct. 15, 2012
Debt instrument, issuance date			October 23, 2007
Convertible senior notes outstanding	400,000,000		400,000,000
Interest rate on notes	1.25%		1.25%
Debt issuance costs for revolving credit facility			4,800,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Amount of outstanding letters of credit	8,700,000		8,700,000		7,300,000
Borrowings under the Credit Agreement	0		0		0
Unused available credit	541,300,000		541,300,000		542,700,000
Unamortized balance of debt issuance costs	$ 7,000,000		$ 7,000,000
Registration Rights Agreement [Member]
Debt Instrument [Line Items]
Debt instrument, issuance date			October 23, 2007
Guarantee And Collateral Agreement [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date			Dec. 01, 2015