4. Goodwill and Intangible Assets

Goodwill

The following table presents changes in the carrying amount of goodwill during the nine months ended January 31, 2019:


	Carrying
	Amount
	(in thousands)
Balance as of April 30, 2018	$	427,645
Goodwill acquired		194,436
Purchase price adjustments from prior periods		8
Translation adjustment		(2,535)
Balance as of January 31, 2019	$	619,554

Intangible Assets

The following tables present the components of the Company’s definite-lived intangible assets as of January 31, 2019 and April 30, 2018:


	Estimated	Weighted	January 31, 2019
	Useful	Average	Gross				Net
	Lives	Amortization	Carrying		Accumulated		Carrying
	(years)	Period	Amount		Amortization		Value
	(dollars in thousands)
Customer relationships	5 - 16	12.9	$	526,120	$	198,642	$	327,478
Definite-lived tradenames	5 - 20	16.3		56,695		6,128		50,567
Vendor agreements	8 - 10	8.3		6,644		3,560		3,084
Developed technology	5	4.9		5,328		723		4,605
Leasehold interests	1 - 15	7.6		3,726		1,319		2,407
Other	3 - 5	3.4		4,181		878		3,303
Totals			$	602,694	$	211,250	$	391,444


	Estimated	Weighted	April 30, 2018
	Useful	Average	Gross				Net
	Lives	Amortization	Carrying		Accumulated		Carrying
	(years)	Period	Amount		Amortization		Value
	(dollars in thousands)
Customer relationships	5 - 13	10.9	$	282,547	$	150,081	$	132,466
Definite-lived tradenames	5 - 20	18.0		26,250		3,578		22,672
Vendor agreement	8 - 10	8.3		6,644		2,956		3,688
Leasehold interests	7 - 15	9.0		2,866		832		2,034
Other	5	5.0		521		66		455
Totals			$	318,828	$	157,513	$	161,315

Definite-lived intangible assets are amortized over their estimated useful lives. The Company amortizes its customer relationships using an accelerated method to match the estimated cash flows generated by such assets, and amortizes its other definite-lived intangibles using the straight-line method because a pattern to which the expected benefits will be consumed or otherwise used up could not be reliably determined. Amortization expense related to definite-lived intangible assets was $18.3 million and $10.5 million for the three months ended January 31, 2019 and 2018, respectively, and $53.3 million and $31.5 million for the nine months ended January 31, 2019 and 2018, respectively. Amortization expense is recorded in depreciation and amortization expense in the Condensed Consolidated Statements of Operations and Comprehensive Income.

Based on the current amount of definite-lived intangible assets, the Company expects to record amortization expense of approximately $17.7 million during the remaining three months in the year ending April 30, 2019 and $64.4 million, $54.6 million, $45.7 million, $38.1 million and $170.9 million during the years ending April 30, 2020, 2021, 2022, 2023 and thereafter, respectively. Actual amortization expense to be reported in future periods could differ materially from these estimates as a result of acquisitions, changes in useful lives, foreign currency exchange rate fluctuations and other relevant factors.

The Company’s indefinite-lived intangible assets consist of tradenames that had a carrying amount of $61.4 million as of January 31, 2019 and April 30, 2018.