Item 6. Selected Financial Data

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Item 6. Selected Financial Data

We acquired TONBELLER Aktiengesellschaft in January 2015, QuadMetrics, Inc. in May 2016, and eZmCom, Inc. in August 2019. Results of operations from the acquisitions are included prospectively from their respective acquisition dates and did not materially impact comparability of the data presented below.



	Year Ended September 30,
	2020 (1)		2019		2018		2017 (1)		2016
	(In thousands, except per share data)
Revenues	$	1,294,562	$	1,160,083	$	1,000,146	$	934,983	$	881,356
Operating income	295,969		253,548		175,359		182,159		169,592
Net income	236,411		192,124		126,482		133,414		109,448
Basic earnings per share	8.13		6.63		4.26		4.32		3.52
Diluted earnings per share	7.90		6.34		4.06		4.14		3.39
Dividends declared per share	—		—		—		0.04		0.08



	September 30,
	2020		2019			2018			2017		2016
	(In thousands)
Working capital	$	119,567	$	(35,122	)	$	(77,514	)	$	22,842	$	21,561
Total assets	1,606,240		1,433,448			1,330,467			1,348,728		1,220,676
Senior notes	750,000		485,000			513,000			244,000		316,000
Revolving line of credit	95,000		345,000			257,000			361,000		255,000
Stockholders’ equity	331,082		289,767			287,437			466,183		446,828

(1) Results of operations for fiscal years 2020 and 2017 included pre-tax charges of $45.0 million and $4.5 million, respectively, in restructuring and impairment charges.

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