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Restructuring Expenses - Summary of Restructuring Accruals and Certain Facility Closures (Detail) - USD ($) |  | 3 Months Ended
--- | --- | ---
Oct. 01, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Restructuring Reserve [Roll Forward] |  |  |
Accrual at September 30, 2017 | $ 1,378,000 | $ 1,378,000 |
Expense Additions |  | 3,104,000 | $ 0
Cash Payments |  | (1,105,000) |
Restructuring Reserve, Accrual Adjustment |  | (1,378,000) |
Accrual at June 30, 2018 |  | 1,999,000 |
Reclassification of accrued lease exit obligations to operating lease liabilities |  | 1,378,000 |
Reclassification of accrued lease exit obligations to operating lease liabilities |  | 97,081,000 |
Facilities charges |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Accrual at September 30, 2017 | 1,378,000 | 1,378,000 |
Expense Additions |  | 0 |
Cash Payments |  | 0 |
Restructuring Reserve, Accrual Adjustment |  | (1,378,000) |
Accrual at June 30, 2018 |  | 0 |
Reclassification of accrued lease exit obligations to operating lease liabilities |  | 1,378,000 |
Employee separation |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Accrual at September 30, 2017 | 0 | 0 |
Expense Additions |  | 3,104,000 |
Cash Payments |  | (1,105,000) |
Restructuring Reserve, Accrual Adjustment |  | 0 |
Accrual at June 30, 2018 |  | 1,999,000 |
Reclassification of accrued lease exit obligations to operating lease liabilities |  | $ 0 |
Accounting Standards Update 2016-02 |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Reclassification of accrued lease exit obligations to operating lease liabilities | 98,900,000 |  |
Accounting Standards Update 2016-02 | Facilities charges |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring Reserve, Accrual Adjustment | (1,400,000) |  |
Reclassification of accrued lease exit obligations to operating lease liabilities | 1,400,000 |  |
Reclassification of accrued lease exit obligations to operating lease liabilities | $ 1,400,000 |  |

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3367-108585 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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- Definition Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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