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Financing (Tables)
 6 Months Ended
Mar. 31, 2018
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Long-term debt consists of the following:
 
 
March 31,
2018
 
September 30,
2017
Long-term debt
 
 
 
 
Tranche B term loan, 1.00% amortizing per year, maturing July 5, 2023
 
$
409,716

 
$
455,400

Tangible equity units, 8.75% coupon, maturing July 1, 2019 1
 
11,945

 
16,443

Capital lease obligations
 
2,268

 
2,466

Total long-term debt
 
423,929

 
474,309

Less: Unamortized underwriting discounts, commissions and other expenses
 
(10,137
)
 
(12,491
)
Less: Current maturities of tranche B term loan debt 2
 
(47,252
)
 
(33,600
)
Less: Current maturities of TEU debt 2, 3
 
(9,474
)
 
(9,152
)
Less: Current maturities of capital lease obligations 2
 
(543
)
 
(522
)
Total long-term debt, less current maturities, net
 
$
356,523

 
$
418,544

1 
See Note 12 for additional information on our TEUs issued in the third quarter of fiscal year 2016.
2 
In addition to the current maturities above, current maturities of long-term debt, net in the Consolidated Balance Sheets includes the current portion of unamortized underwriting discounts, commissions and other expenses of $4,059 and $4,179 as of March 31, 2018 and September 30, 2017, respectively.
3 
As of March 31, 2018 and September 30, 2017, current maturities of tranche B term loan consists of the 1% annual payment and the calculated or estimated required annual Excess Cash Flow payment as defined below, as well as planned prepayments.
Schedule of Derivative Instruments
The interest rate swap will be reduced to the following notional amounts over the next four years:
 
 
Notional Amount

October 3, 2018
 
$
225,000

October 3, 2019
 
180,000

October 3, 2020
 
125,000

April 3, 2021
 
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