Long-Term Debt (Bank Credit Facility) (Narrative) (Details) (USD $)	9 Months Ended		9 Months Ended			9 Months Ended		9 Months Ended						9 Months Ended
	Mar. 31, 2013	Jun. 30, 2012	Mar. 31, 2013 Bank Credit Facility [Member]	Mar. 31, 2013 Bank Credit Facility [Member] Long-term Debt [Member]	Mar. 31, 2013 Bank Credit Facility [Member] Other Assets [Member]	Mar. 31, 2013 Revolving Credit Facility [Member] Long-term Debt [Member]	Mar. 31, 2013 Revolving Credit Facility [Member] Bank Credit Facility [Member]	Mar. 31, 2013 Term Loan [Member] Long-term Debt [Member]	Mar. 31, 2013 Term Loan [Member] Bank Credit Facility [Member]	Mar. 31, 2013 Same-Day Swing Line Loan [Member]	Oct. 21, 2010 Same-Day Swing Line Loan [Member] Bank Credit Facility [Member]	Mar. 31, 2013 Stand-By Letters Of Credit [Member]	Oct. 21, 2010 Stand-By Letters Of Credit [Member] Bank Credit Facility [Member]	Mar. 31, 2013 Principal Payment Through September 30, 2015 [Member] Term Loan [Member] Bank Credit Facility [Member]	Mar. 31, 2013 Principal Payment From October 1, 2015 Through September 30, 2016 [Member] Term Loan [Member] Bank Credit Facility [Member]
Debt Instrument [Line Items]
Unamortized debt issuance expense	$ 3,910,000	$ 4,654,000		$ 3,200,000	$ 1,500,000
Credit facility, amount outstanding	270,000,000	125,000,000					270,000,000
Credit facility maximum borrowing capacity			900,000,000				750,000,000		150,000,000		50,000,000		25,000,000
Loan maturity date						Nov. 18, 2016		Nov. 18, 2016
Term loan period	5 years
Term loan principal payment														1,900,000	3,800,000
Term loan maximum additional borrowing capacity			150,000,000
Outstanding borrowings interest rate			1.70%
Fair value of the Credit Facility										0		400,000
Debt issuance cost capitalized			$ 7,900,000