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Goodwill and other intangible assets | 6 Months Ended
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Apr. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and other intangible assets | Goodwill and other intangible assets Changes in the carrying amount of goodwill for th e six months ended April 30, 2022 by operating segment were as follows:
|  | Industrial Precision Solutions |  | Advanced Technology Solutions |  | Total
Balance at October 31, 2021 |  | $ | 415,020 |  |  | $ | 1,298,128 |  |  | $ | 1,713,148 |
Acquisitions |  | 129,856 |  |  | — |  |  | 129,856 |
Currency effect |  | (12,431) |  |  | (9,482) |  |  | (21,913) |
Balance at April 30, 2022 |  | $ | 532,445 |  |  | $ | 1,288,646 |  |  | $ | 1,821,091 |
The increase in goodwill for the six months ended April 30, 2022 was due to the acquisition of NDC. See Acquisitions Note for additional details. Information regarding our intangible assets subject to amortization was as follows:
|  | April 30, 2022
|  | Carrying Amount |  | Accumulated Amortization |  | Net Book Value
Customer relationships |  | $ | 485,584 |  |  | $ | 238,359 |  |  | $ | 247,225 |
Patent/technology costs |  | 160,542 |  |  | 92,682 |  |  | 67,860 |
Trade name |  | 83,806 |  |  | 42,209 |  |  | 41,597 |
Non-compete agreements |  | 10,448 |  |  | 9,184 |  |  | 1,264 |
Other |  | 1,209 |  |  | 1,203 |  |  | 6 |
Total |  | $ | 741,589 |  |  | $ | 383,637 |  |  | $ | 357,952 |
|  | October 31, 2021
|  | Carrying Amount |  | Accumulated Amortization |  | Net Book Value
Customer relationships |  | $ | 483,815 |  |  | $ | 226,658 |  |  | $ | 257,157 |
Patent/technology costs |  | 154,267 |  |  | 89,299 |  |  | 64,968 |
Trade name |  | 74,301 |  |  | 39,858 |  |  | 34,443 |
Non-compete agreements |  | 9,896 |  |  | 9,099 |  |  | 797 |
Other |  | 1,385 |  |  | 1,383 |  |  | 2 |
Total |  | $ | 723,664 |  |  | $ | 366,297 |  |  | $ | 357,367 |
Amortization expense for the three months ended April 30, 2022 and 2021 was $12,572 and $12,617, respectively. Amortization expense for the six months ended April 30, 2022 and 2021 was $25,657 and $25,697, respectively. See Acquisitions Note for details regarding intangibles recorded due to the acquisition of NDC.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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