External financing (Details Textuals) (USD $)	9 Months Ended		3 Months Ended							3 Months Ended
	Mar. 31, 2012	Mar. 31, 2012 5.875% Notes due March 15, 2014 [Member]	Mar. 31, 2012 Credit Agreement [Member]	Jul. 02, 2011 Credit Agreement [Member]	Mar. 31, 2012 6.00% Notes due September 1, 2015 [Member]	Mar. 31, 2012 6.625% Notes due September 15, 2016 [Member]	Mar. 31, 2012 5.875% Notes due June 15, 2020 [Member]	Mar. 31, 2012 Bank Credit Facilities [Member]	Jul. 02, 2011 Bank Credit Facilities [Member]	Mar. 31, 2012 Accounts Receivable Securitization Program [Member]	Jul. 02, 2011 Accounts Receivable Securitization Program [Member]
Debt Instrument [Line Items]
Weighted average interest rate on bank credit facilities								7.50%	7.80%
Accounts receivable securitization program maximum borrowing amount										$ 750,000,000	$ 600,000,000
Accounts Receivable Securitization Loan Program Term	1 year
Accounts Receivable securitization program, expiration date										August 2012
Terms on which interest on borrowings is calculated										base rate or a commercial paper rate plus a spread
Interest on borrowings										0.35%
Program facility fee										0.35%
Line of Credit Facility Term	5 years
Unsecured revolving credit facility			1,000,000,000	500,000,000
Line of credit facility expiration date			November 2016
Unsecured revolving credit facility			21,847,000	122,093,000
Letters of credit outstanding, amount			17,102,000	16,602,000
Senior Notes interest rate		5.875%			6.00%	6.625%	5.875%
Company's debt, carrying value	2,118,243,000
Company's debt, fair value	$ 2,266,203,000