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Restructuring Expenses - Additional Information (Detail) | 12 Months Ended
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Sep. 30, 2017 USD ($) position | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) position
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | $ 4,471,000 | $ 0 | $ 17,500,000
Number of positions reduced | position | 79 |  | 97
Facilities charges |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | $ 1,729,000 | 0 | $ 13,600,000
Employee separation |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | $ 2,742,000 | $ 0 | $ 3,900,000

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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to 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 S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 4: http://www.xbrl.org/2003/role/presentationRef -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=27011515&loc=d3e140904-122747 + Details
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