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Debt and Financing Arrangements - Additional Information (Detail) € in Millions, $ in Millions, ¥ in Billions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2019 EUR (€) | Jun. 30, 2019 JPY (¥) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 EUR (€) | Mar. 31, 2019 JPY (¥) | Sep. 30, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt tender offer to purchase up to $1.5 billion in aggregate principal | $ 1,500.0 |  |  |  |  |  |  |  |  |  |
Total Consideration of Debt Tender Offer | 1,600.0 |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt | 60.0 |  | $ 0.0 |  | $ 60.0 |  |  | $ 0.0 |  |  |
Notes Payable to Banks [Member] | 5.25 percent due 2041 [Domain] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount | $ 2.5 |  |  |  | $ 2.5 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.25% |  |  |  | 5.25% |  |  |  | 5.25% |  |
Notes Payable to Banks [Member] | Floating rate term loan [Domain] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt | ¥ |  |  |  |  |  |  | ¥ 10 |  |  |  |
Debt Instrument, Face Amount | ¥ |  |  |  |  |  |  |  |  |  | ¥ 35 |
Notes Payable to Banks [Member] | 1.375 percent due 2025 [Domain] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount | € |  |  |  |  |  |  |  |  | € 4.7 |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.375% |  |  |  | 1.375% |  |  |  | 1.375% |  |
Notes Payable to Banks [Member] | 3.9 percent due 2026 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  | $ 12.0 |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.90% |  |  |  |  |  |  |  | 3.90% |
Tyco International Holding S.a.r.L. (TSarL) [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  | $ 1,900.0 |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |  |  | $ 4,000.0
Tyco International Holding S.a.r.L. (TSarL) [Member] | Notes Payable to Banks [Member] | $364 million due March 2020 [Domain] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  |  | $ 364.0 |  |  |  |  |  |
Tyco International Holding S.a.r.L. (TSarL) [Member] | Notes Payable to Banks [Member] | $250 million USD expiring in Mar 2020 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  |  | 250.0 |  |  |  |  |  |
Tyco International Holding S.a.r.L. (TSarL) [Member] | Notes Payable to Banks [Member] | 215 million euro floating due July 2019 [Domain] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt | € |  |  |  |  |  | € 215.0 |  |  |  |  |
Notes Payable to Banks [Member] | $750 million term loan due earlier of Jan 2020 or 5 days after PS Close [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  |  | $ 750.0 |  |  |  |  |  |
Revolving Credit Facility [Member] | Floating rate term loan [Domain] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term | 5 years |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | 250 million USD maturing in Mar 2019 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  | 364 days |  |  |  |  |  |  |  |  |
Line of Credit Facility, Borrowing Capacity, Expired |  | $ 250.0 |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | $250 million USD expiring in Mar 2020 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 250.0 |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | 150 million USD maturing in Feb 2019 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  | 364 days |  |  |  |  |  |  |  |  |
Line of Credit Facility, Borrowing Capacity, Expired |  | $ 150.0 |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | $150 million USD expiring in February 2020 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 150.0 |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | 200 million USD maturing in Jan 2019 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  | 364 days |  |  |  |  |  |  |  |  |
Line of Credit Facility, Borrowing Capacity, Expired |  | $ 200.0 |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | $350 million USD expiring in Jan 2020 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 350.0 |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Tyco International Holding S.a.r.L. (TSarL) [Member] | $1.25 billion due August 2020 [Domain] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of Credit, Borrowing Capacity, Terminated | $ 1,250.0 |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Tyco International Holding S.a.r.L. (TSarL) [Member] | $250 million USD expiring in Mar 2020 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  | 364 days |  |  |  |  |  |  |  |  |

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