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Restructuring Expenses - Summary of Restructuring Accruals and Certain Facility Closures (Detail) - USD ($) | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Restructuring Reserve [Roll Forward] |  |  |
Beginning balance | $ 9,233,000 | $ 15,400,000 |
Expense additions | 4,471,000 | 0 | $ 17,500,000
Cash payments | (5,399,000) | (6,167,000) |
Ending balance | 8,305,000 | 9,233,000 | 15,400,000
Less: current portion | (3,077,000) | (4,266,000) | (5,570,000)
Non-current | 5,228,000 | 4,967,000 | 9,830,000
Facilities charges |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Beginning balance | 9,233,000 | 12,995,000 |
Expense additions | 1,729,000 | 0 | 13,600,000
Cash payments | (2,842,000) | (3,762,000) |
Ending balance | 8,120,000 | 9,233,000 | 12,995,000
Employee separation |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Beginning balance | 0 | 2,405,000 |
Expense additions | 2,742,000 | 0 | 3,900,000
Cash payments | (2,557,000) | (2,405,000) |
Ending balance | $ 185,000 | $ 0 | $ 2,405,000

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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/presentationRef -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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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