Goodwill and Acquired Intangibles (Details 2) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jul. 02, 2022	Jul. 03, 2021	Jul. 02, 2022	Jul. 03, 2021
Amortization of acquired intangibles
Cost of product and maintenance	$ 10,068	$ 12,232	$ 22,039	$ 24,000
Amortization of acquired intangibles	4,633	5,030	9,597	9,661
Total amortization of acquired intangibles	$ 14,701	$ 17,262	$ 31,636	$ 33,661

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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