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Acquisition-related Intangible Assets, Net - Schedule of Acquired Assets (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 31, 2019 | Jul. 31, 2018 | Jul. 31, 2019 | Jul. 31, 2018 | Jan. 31, 2019
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets, gross | $ 402,400 |  | $ 402,400 |  | $ 398,800
Less accumulated amortization | (124,447) |  | (124,447) |  | (85,560)
Total | 277,953 |  | 277,953 |  | 313,240
Goodwill, acquired during period | 9,000 |  |  |  |
Amortization of intangible assets | 20,000 | $ 5,000 | 39,000 | $ 10,000 |
Developed technology |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets, gross | 190,400 |  | 190,400 |  | 186,800
Finite-lived intangible assets acquired | 4,000 |  |  |  |
Customer relationships |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets, gross | 189,000 |  | 189,000 |  | 189,000
Trade name |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets, gross | 12,000 |  | 12,000 |  | 12,000
Backlog |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets, gross | $ 11,000 |  | $ 11,000 |  | $ 11,000

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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