Credit Arrangements - 2013 Credit Agreement (Details) - USD ($)	1 Months Ended		9 Months Ended	12 Months Ended
	May 31, 2013	Sep. 30, 2011	Mar. 31, 2015	Jun. 30, 2016	Oct. 01, 2015	Jun. 30, 2015	Jun. 12, 2015	Mar. 22, 2013
Debt Instrument [Line Items]
Long-term Debt				$ 504,400,000
Long-term Debt, Gross							$ 7,100,000
Commitment fee on revolving loan unused amount, percentage			0.30%
Derivative Interest Rate Cap Arrangement			2.00%
Derivative, Fixed Interest Rate	0.73%				1.104%
Notional Amount				$ 468,700,000		$ 468,500,000
Term Loan [Member]
Debt Instrument [Line Items]
Long-term Debt								$ 200,000,000.0
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity								300,000,000.0
Line of Credit Facility, Additional Borrowing Capacity								200,000,000.0
Letters of Credit Outstanding, Amount								10,000,000.0
Swingline Loan [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity								$ 75,000,000.0
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	$ 100,000,000	$ 100,000,000	$ 100,000,000
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			$ 25,000,000