Goodwill and Intangible Assets (Tables)

9 Months Ended

Jun. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of changes in carrying amount of goodwill by segment

The changes in the carrying amount of goodwill by segment for the period from September 30, 2017 to June 30, 2018 are as follows (in thousands):

	OEM Laser Sources			Industrial Lasers & Systems			Total
Balance as of September 30, 2017	$	102,178		$	315,516		$	417,694
Additions (see Note 3)	—			31,456			31,456
Translation adjustments and other	(1,143		)	(3,941		)	(5,084		)
Balance as of June 30, 2018	$	101,035		$	343,031		$	444,066

Schedule of components of amortizable intangible assets

Components of our amortizable intangible assets are as follows (in thousands):

	June 30, 2018							September 30, 2017
	Gross Carrying Amount		Accumulated Amortization			Net		Gross Carrying Amount		Accumulated Amortization			Net
Existing technology	$	203,343	$	(83,460	)	$	119,883	$	208,341	$	(66,793	)	$	141,548
Patents	—		—			—		330		(58		)	272
Customer relationships	50,393		(20,347		)	30,046		51,687		(14,259		)	37,428
Trade name	5,888		(3,317		)	2,571		6,171		(1,824		)	4,347
In-process research & development	4,864		—			4,864		6,432		—			6,432
Total	$	264,488	$	(107,124	)	$	157,364	$	272,961	$	(82,934	)	$	190,027

Schedule of estimated amortization expense

At June 30, 2018, estimated amortization expense for the remainder of fiscal 2018, the next five succeeding fiscal years and all fiscal years thereafter are as follows (in thousands):

	Estimated Amortization Expense
2018 (remainder)	$	14,700
2019	56,129
2020	48,811
2021	17,058
2022	5,593
2023	3,054
Thereafter	7,155
Total (excluding IPR&D)	$	152,500