Debt (Narrative) (Detail) (USD $)	3 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Jun. 30, 2012	Oct. 21, 2011
Debt Disclosure [Line Items]
Short-term borrowings outstanding	$ 212,000		$ 227,000
Lines of credit	27,300,000		17,800,000
Borrowings under the Credit Agreement	0		0
Unamortized balance of debt issuance costs	100,000		300,000
Debt instrument, issuance date	Oct. 23, 2007
Effective interest rate, Convertible Senior Notes	5.60%
Principal amount of Convertible Senior Notes	1,000
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
Amortization of discount, Convertible Senior Notes	200,000	200,000
Number of business days to file registration statement				7
Guarantee And Collateral Agreement [Member]
Debt Disclosure [Line Items]
Borrowings under the Credit Agreement	0
Amount of outstanding letters of credit	8,700,000
Debt instrument, maturity date	2015-12-01
Convertible Senior Notes [Member]
Debt Disclosure [Line Items]
Convertible Senior Notes outstanding	400,000,000		400,000,000
Debt instrument, maturity date	Oct. 15, 2012
Effective interest rate, Convertible Senior Notes	1.25%
Initial conversion rate, shares per principal amount	9.6154
Principal amount of Convertible Senior Notes	1,000
Initial conversion price per share	$ 104
Debt issuance costs for revolving credit facility	4,800,000
Noncash interest expense	4,300,000	4,200,000
Registration Rights Agreement [Member] | Convertible Senior Notes [Member]
Debt Disclosure [Line Items]
Period of effectiveness of registration statement, maximum	Five years and three months
Possible additional interest rate to be accrued, per annum	0.25%
Revolving Credit Facility [Member]
Debt Disclosure [Line Items]
Amount of outstanding letters of credit	8,700,000		8,700,000
Unused available credit	541,300,000		541,300,000
Unamortized balance of debt issuance costs	$ 7,000,000