Long-term Debt (Details)	12 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2013 USD ($)
Debt Instrument [Line Items]
Subordinated note interest rate	3.25%
Write off of deferred financing costs		$ 600,000
Covenant requirement, maximum ratio of debt to trailing 12 month EBITDA	3.75
Covenant requirement, minimum ratio of EBITDA to interest expense	2.75
Interest expense related to long-term debt	$ 18,500,000	$ 10,900,000	$ 12,700,000
Line of Credit [Member] | Asset-backed Bank Facility [Member]
Debt Instrument [Line Items]
Accounts receivable net of reserves outstanding under revolving agreement	$ 172,000,000
Line of credit facility weighted average effective interest rate	1.04%
Maximum borrowing capacity	$ 100,000,000
Credit facility remaining borrowing capacity	$ 20,000,000
Line of Credit [Member] | Asset-backed Bank Facility [Member] | Minimum [Member]
Debt Instrument [Line Items]
Commitment fee percentage	0.40%
Line of Credit [Member] | Asset-backed Bank Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Commitment fee percentage	0.45%
Line of Credit [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility weighted average effective interest rate	1.88%
Maximum borrowing capacity	$ 200,000,000
Debt instrument term	5 years
Credit facility remaining borrowing capacity	$ 122,500,000
Credit facility, maximum additional borrowing capacity available	$ 200,000,000
Line of Credit [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Debt Instrument [Line Items]
Commitment fee percentage	0.125%
Line of Credit [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Commitment fee percentage	0.25%
Term Loan Facility [Member] | Term Loan Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 250,000,000
Senior Notes [Member] | Senior Notes Due 2022 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 100,000,000
Effective interest rate	3.03%
Senior Notes [Member] | Senior Notes Due 2024 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 150,000,000
Effective interest rate	3.26%