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Summary of Significant Accounting Policies - Summary of Impact of Adoption of ASC 842 on Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Oct. 01, 2019 | Sep. 30, 2019
--- | --- | --- | ---
Prepaid expenses and other current assets | $ 229,604 |  | $ 216,084
Lease assets | 295,494 |  |
Other noncurrent assets | 488,620 |  | 423,941
Accrued expenses and other current liabilities | (593,608) |  | (647,657)
Lease liabilities (current) | (59,100) |  |
Lease liabilities (non-current) | (230,076) |  |
Other noncurrent liabilities | $ (327,680) |  | (334,922)
Accounting Standards Update 2016-02 [Member] |  |  |
Prepaid expenses and other current assets |  | $ 209,387 |
Lease assets |  | 281,785 |
Other noncurrent assets |  | 421,186 |
Accrued expenses and other current liabilities |  | (644,104) |
Lease liabilities (current) |  | (63,351) |
Lease liabilities (non-current) |  | (221,050) |
Other noncurrent liabilities |  | $ (326,407) |
Accounting Standards Update 2016-02 [Member] | Adjustments due to ASC 842 [Member] |  |  |
Prepaid expenses and other current assets |  |  | (6,697)
Lease assets |  |  | 281,785
Other noncurrent assets |  |  | (2,755)
Accrued expenses and other current liabilities |  |  | 3,553
Lease liabilities (current) |  |  | (63,351)
Lease liabilities (non-current) |  |  | (221,050)
Other noncurrent liabilities |  |  | $ 8,515

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