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Long Term Debt - Term Loan B and Revolver (Details) - USD ($) |  | 3 Months Ended
--- | --- | ---
Jan. 16, 2014 | Sep. 30, 2016 | Sep. 30, 2015
Term Loan B |  |  |
Debt Instrument [Line Items] |  |  |
Credit agreement, maximum capacity | $ 800,000,000 |  |
Term loan period, years | 7 years |  |
Term loan quarterly repayment as percentage of principal | 0.25% |  |
Interest addition to floating rate | 0.75% |  |
Interest expense |  | $ 6,500,000 | $ 6,500,000
Revolver |  |  |
Debt Instrument [Line Items] |  |  |
Credit agreement, maximum capacity |  | $ 300,000,000 |
London Interbank Offered Rate (LIBOR) | Term Loan B |  |  |
Debt Instrument [Line Items] |  |  |
Interest addition to floating rate | 2.50% |  |

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