Long-Term Debt (Tables)

12 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Long-term debt instruments

The following tables present our debt instruments outstanding, contractual maturities and interest expense:

	September 30, 2018							September 30, 2017
	Gross Amount		Debt Discount and Issuance Costs			Carrying Amount		Gross Amount		Debt Discount and Issuance Costs			Carrying Amount
	(in thousands)
2019 Convertible Notes	$	195,000	$	(7,567	)	$	187,433	$	195,000	$	(17,654	)	$	177,346
2019 Convertible Notes Embedded Derivative	2,552		—			2,552		6,591		—			6,591
2024 Convertible Notes	143,750		(37,892		)	105,858		143,750		(42,880		)	100,870
2025 Convertible Notes	172,500		(52,764		)	119,736		—		—			—
8.5% unsecured notes due 2024*	1,304		—			1,304		—		—			—
Total	$	515,106	$	(98,223	)	$	416,883	$	345,341	$	(60,534	)	$	284,807
Less current portion	197,748		(7,567		)	190,181		—		—			—
Total long-term debt	$	317,358	$	(90,656	)	$	226,702	$	345,341	$	(60,534	)	$	284,807

* Amount translated from Guatemalan quetzals as of September 30, 2018. Certain disclosures omitted due to materiality considerations.

Schedule of maturities of debt

	Principal Payment Schedule
	Total		Less Than 1 Year		1 - 3 Years		3 - 5 Years		More Than 5 Years
	(in thousands)
2019 Convertible Notes*	$	195,000	$	195,000	$	—	$	—	$	—
2024 Convertible Notes*	143,750		—		—		—		143,750
2025 Convertible Notes*	172,500		—		—		—		172,500
8.5% unsecured notes due 2024	1,304		196		428		428		252
	$	512,554	$	195,196	$	428	$	428	$	316,502

* Excludes the potential impact of the embedded derivative.

Schedule of Interest Expense

	Fiscal Year Ended September 30,
	2018		2017		2016
	(in millions)
Term Loan Facility:
Contractual interest expense	$	—	$	4.3	$	0.4
Amortization of debt discount and deferred financing costs	—		0.4		—
Total interest expense	$	—	$	4.7	$	0.4
2019 Convertible Notes:
Contractual interest expense	$	4.1	$	4.7	$	4.9
Amortization of debt discount and deferred financing costs	10.0		10.8		10.6
Total interest expense	$	14.1	$	15.5	$	15.5
2024 Convertible Notes:
Contractual interest expense	$	4.1	$	1.0	$	—
Amortization of debt discount and deferred financing costs	5.1		1.1		—
Total interest expense	$	9.2	$	2.1	$	—
2025 Convertible Notes:
Contractual interest expense	$	1.6	$	—	$	—
Amortization of debt discount and deferred financing costs	2.3		—		—
Total interest expense	$	3.9	$	—	$	—