Derivative Instruments and Hedging Activities (Details Textual) (USD $)	1 Months Ended	12 Months Ended
	Feb. 28, 2009	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2009
Additional Derivative Instruments and Hedging Activities (Textuals) [Abstract]
Notional amount of the contracts translated into U.S. dollars		$ 37,600,000
Derivative Instruments and Hedging Activities (Textuals) [Abstract]
Terminated Interest Rate Swap Contracts	200,000,000
Cash received upon termination of contract	13,200,000
Proceeds from interest rate swap agreement termination related to forward portion				12,600,000
Proceeds from interest rate swap agreement termination related to current interest portion				600,000
Liability on forward starting interest rate swap contracts recorded as offset in other comprehensive loss, net of tax		2,400,000	2,300,000
Gains or losses recognized in earnings due to ineffectiveness and excluded from effectiveness testing		0	0
Interest Rate Swap Contracts [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Reduction in interest expense		5,867,000	5,556,000	3,170,000
Forward starting interest rate swap contracts [Member]
Additional Derivative Instruments and Hedging Activities (Textuals) [Abstract]
Notional amount of the contracts translated into U.S. dollars		150,000,000	75,000,000
Fixed To Floating Interest Rate Swap Contracts [Member]
Additional Derivative Instruments and Hedging Activities (Textuals) [Abstract]
Derivative contracts amount outstanding		0	0
Contracts translated to US dollars [Member]
Additional Derivative Instruments and Hedging Activities (Textuals) [Abstract]
Notional amount of the contracts translated into U.S. dollars		$ 37,600,000	$ 9,400,000