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Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2018 | Apr. 01, 2017 | Mar. 31, 2018 | Apr. 01, 2017 | Dec. 30, 2017 | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 24, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Marketable Securities, Unrealized Gain (Loss) |  | $ 4.0 |  |  |  |  |  |
Changes in foreign currency translation adjustment | $ 10.1 | 3.4 | $ 15.6 | $ (12.3) |  |  |  |
Changes in unrealized holding gains and losses on available-for-sale securities, net of tax of $0.0 and $0.2 for the three and six months ended March 31, 2018 and $0.1 and $0.2 for the three and six months ended April 1, 2017: | 0.0 | 0.1 | 0.0 | 2.4 |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent | 0.0 | 0.0 | 0.6 | 0.0 |  |  |  |
Changes in value of hedged interest rate caps, net of tax of $0.3 and $(4.6) for the three and six months ended March 31, 2018 and $0.3 and $0.7 for the three and six months ended April 1, 2017: |  | 0.4 |  | 1.1 |  |  |  |
Accumulated other comprehensive loss | (0.6) |  | (0.6) |  |  | $ (16.2) |  |
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Changes in foreign currency translation adjustment | 10.1 | 3.4 | 15.6 | (12.3) |  |  |  |
Restructuring Reserve, Translation and Other Adjustment | 0.0 | 0.0 | 0.0 | 0.0 |  |  |  |
Accumulated other comprehensive loss | (2.9) | (38.4) | (2.9) | (38.4) |  | (18.5) |  | $ (26.1)
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax | (2.9) | (38.4) | (2.9) | (38.4) | $ (13.0) |  | $ (41.8) |
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax |  | (0.3) |  | (0.3) |  |  | 2.1 |
Changes in unrealized holding gains and losses on available-for-sale securities, net of tax of $0.0 and $0.2 for the three and six months ended March 31, 2018 and $0.1 and $0.2 for the three and six months ended April 1, 2017: |  | 0.1 | 0.0 | 2.4 |  |  |  |
Restructuring Reserve, Translation and Other Adjustment |  | (2.5) | (0.4) | 2.4 |  |  |  |
Accumulated other comprehensive loss | 0.0 | (0.3) | 0.0 | (0.3) |  | (0.4) |  | (0.3)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax | (1.0) | (2.5) | (1.0) | (2.5) | (1.0) |  | (2.5) |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent | 0.0 |  | 0.6 | 0.0 |  |  |  |
Restructuring Reserve, Translation and Other Adjustment | 0.0 | 0.0 | 0.0 | 0.0 |  |  |  |
Accumulated other comprehensive loss | (1.0) | (2.5) | (1.0) | (2.5) |  | (1.6) |  | (2.5)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Accumulated other comprehensive Income loss Hedge | 3.3 | 1.0 | 3.3 | 1.0 | 2.3 |  | (0.6) |
Changes in value of hedged interest rate caps, net of tax of $0.3 and $(4.6) for the three and six months ended March 31, 2018 and $0.3 and $0.7 for the three and six months ended April 1, 2017: | 0.7 | 0.4 | (3.6) | 1.1 |  |  |  |
Restructuring Reserve, Translation and Other Adjustment | 0.3 | 1.2 | (2.6) | (3.3) |  |  |  |
Accumulated other comprehensive loss | 3.3 | 1.0 | 3.3 | 1.0 |  | 4.3 |  | (3.4)
AOCI Attributable to Parent [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss) before Reclassifications, Tax | 10.8 | 3.9 | (12.6) | 8.8 |  |  |  |
Restructuring Reserve, Translation and Other Adjustment | 0.3 | (1.3) | (3.0) | (0.9) |  |  |  |
Accumulated other comprehensive loss | $ (0.6) | $ (40.2) | $ (0.6) | $ (40.2) | $ (11.7) | $ (16.2) | $ (42.8) | $ (32.3)

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- Definition Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=64808268&loc=d3e32022-110900 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 + Details
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