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Goodwill and Intangible Assets, Net (Tables) | 12 Months Ended
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Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract] |
Details of Total Goodwill | The following table presents details of the Company’s total goodwill:
As of October 1, 2013 |  | $ | 1,818,334 |
Goodwill resulting from acquisitions(1) |  |  | 100,935 |
Other |  |  | 5,956 |
As of September 30, 2014 |  |  | 1,925,225 |
Goodwill resulting from acquisitions(2) |  |  | 123,987 |
Other |  |  | (119 | )
As of September 30, 2015 |  | $ | 2,049,093 |
(1) | Mainly relates to the acquisition of Celcite. In allocating the total preliminary purchase price of Celcite based on estimated fair values, the Company recorded $78,142 of goodwill, $46,432 of customer relationships to be amortized over approximately four years, $22,372 of core technology to be amortized over approximately three years and $1,781 of other intangible assets to be amortized over approximately three years.
(2) | Mainly relates to the acquisition of a substantial majority of the BSS assets of Comverse. In allocating the total preliminary purchase price of the acquired assets based on estimated fair values, the Company recorded $118,101 of goodwill, $97,000 of core technology to be amortized over a weighted average of approximately four years and $38,639 of customer relationships to be amortized over a weighted average of approximately five years.
Details Regarding Total Definite-Lived Purchased Intangible Assets | The following table presents details regarding the Company’s total definite-lived purchased intangible assets:
|  | Estimated Useful Life (in years) |  |  | Gross |  |  | Accumulated Amortization |  |  | Net |
September 30, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Core technology |  |  | 2-8 |  |  | $ | 531,669 |  |  | $ | (398,898 | ) |  | $ | 132,771 |
Customer relationships |  |  | 3-15 |  |  |  | 439,435 |  |  |  | (328,747 | ) |  |  | 110,688 |
Intellectual property rights and purchased computer software |  |  | — |  |  |  | 51,996 |  |  |  | (51,996 | ) |  |  | — |
Other |  |  | 3-10 |  |  |  | 31,666 |  |  |  | (22,608 | ) |  |  | 9,058 |
Total |  |  |  |  |  | $ | 1,054,766 |  |  | $ | (802,249 | ) |  | $ | 252,517 |
September 30, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Core technology |  |  | 3-8 |  |  | $ | 434,669 |  |  | $ | (367,609 | ) |  | $ | 67,060 |
Customer relationships |  |  | 4-15 |  |  |  | 398,519 |  |  |  | (297,791 | ) |  |  | 100,728 |
Intellectual property rights and purchased computer software |  |  | — |  |  |  | 51,996 |  |  |  | (51,996 | ) |  |  | — |
Other |  |  | 1-10 |  |  |  | 31,666 |  |  |  | (18,227 | ) |  |  | 13,439 |
Total |  |  |  |  |  | $ | 916,850 |  |  | $ | (735,623 | ) |  | $ | 181,227 |
Amortization Expense on Definite-Lived Intangible Assets | The following table presents the amortization expense of the Company’s definite-lived purchased intangible assets, included in each financial statement caption reported in the consolidated statements of income:
|  | Year Ended September 30, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Cost of revenue |  | $ | 1,609 |  |  | $ | 1,609 |  |  | $ | 1,609 |
Amortization of definite-lived purchased intangible assets |  |  | 65,017 |  |  |  | 55,799 |  |  |  | 34,543 |
Total |  | $ | 66,626 |  |  | $ | 57,408 |  |  | $ | 36,152 |
Estimated Future Amortization Expense | The estimated future amortization expense of definite-lived purchased intangible assets as of September 30, 2015 is as follows:
|  | Amount |
Fiscal year: |  |  |  |
2016 |  | $ | 90,488 |
2017 |  |  | 76,742 |
2018 |  |  | 46,958 |
2019 |  |  | 22,863 |
2020 |  |  | 10,707 |
Thereafter |  |  | 4,759 |
Total |  | $ | 252,517 |

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