4. Goodwill and Other Intangible Assets:

Goodwill amounts by reportable segment are summarized as follows:


	Goodwill at								Goodwill at
	December 26,								March 27,
	2020		Acquisitions		Dispositions		Other(1)		2021
Hardware and Protective Solutions	$	565,578	$	—	$	—	$	(124)	$	565,454
Robotics and Digital Solutions		220,936		—		—		—		220,936
Canada		29,686		—		—		602		30,288
Total	$	816,200	$	—	$	—	$	478	$	816,678

(1)

The “Other” change to goodwill relates to adjustments resulting from fluctuations in foreign currency exchange rates for the Canada and Mexico reporting units.

Other intangibles, net, as of March 27, 2021 and December 26, 2020 consist of the following:


	Estimated
	Useful Life		March 27,		December 26,
	(Years)		2021		2020
Customer relationships		13 – 20	$	942,131	$	941,648
Trademarks – Indefinite		Indefinite		85,713		85,603
Trademarks – Other		7 – 15		26,400		26,400
Technology and patents		7 – 12		63,761		63,749
Intangible assets, gross				1,118,005		1,117,400
Less: Accumulated amortization				306,509		291,434
Other intangibles, net			$	811,496	$	825,966

The amortization expense for amortizable assets, including the adjustments resulting from fluctuations in foreign currency exchange rates for the thirteen weeks ended March 27, 2021 was $14,909. Amortization expense for the thirteen weeks ended March 28, 2020 was $14,848.

The Company tests goodwill and indefinite-lived intangible assets for impairment annually in the fourth quarter. Impairment is also tested when events or changes in circumstances indicate that the carrying values of the assets may be greater than their fair values. During the thirteen weeks ended March 27, 2021 and the thirteen weeks ended March 28, 2020, the Company did not identify any triggering events that would result in an impairment analysis outside of the annual assessment.