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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Fixed interest rate related to the interest rate derivative.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Credit Arrangements - 2013 Credit Agreement (Details) - Debt Instrument, Name [Domain] - USD ($) $ in Thousands	1 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2011	Mar. 31, 2015	Jun. 30, 2015	Jun. 12, 2015	Jun. 30, 2014	May. 31, 2013	Mar. 22, 2013	Jun. 30, 2011
Debt Instrument [Line Items]
Long-term Debt			$ 357,079
Long-term Debt, Gross				$ 7,100
Commitment fee on revolving loan unused amount, percentage		0.30%
Derivative Interest Rate Cap Arrangement		2.00%
Derivative, Fixed Interest Rate						0.73%
Notional Amount			468,480		$ 568,853
Term Loan [Member]
Debt Instrument [Line Items]
Long-term Debt							$ 200,000	$ 100,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity							300,000	$ 300,000
Line of Credit Facility, Additional Borrowing Capacity							200,000
Letters of Credit Outstanding, Amount							10,000
Remaining borrowing capacity available			$ 250,000
Debt, Weighted Average Interest Rate			3.05%
Swingline Loan [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity							$ 75,000
2013 Credit Agreement [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate		0.00%
2013 Credit Agreement LIBOR [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.75%
2013 Credit Agreement One Month LIBOR Margin [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			0.75%
2013 Credit Agreement Swingline [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			0.75%
Interest Rate Swap [Member]
Debt Instrument [Line Items]
Principal amount of debt hedged with an interest rate swap agreement	$ 100,000	$ 100,000
Derivative, Fixed Interest Rate	1.30%
Interest Rate Cap [Member]
Debt Instrument [Line Items]
Principal amount of debt hedged with an interest rate swap agreement		$ 25,000
Derivatives Designated As Hedging Instruments [Member]
Debt Instrument [Line Items]
Notional Amount			$ 340,699		$ 418,141
Derivatives Designated As Hedging Instruments [Member] \| Interest Rate Contract [Member]
Debt Instrument [Line Items]
Notional Amount			$ 125,000