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Derivative Financial Instruments - Additional Information (Detail) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2017 USD ($) ozt | Mar. 31, 2016 USD ($) | Mar. 31, 2017 USD ($) ozt T | Mar. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) ozt T | Sep. 30, 2012 USD ($)
Derivative Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Document Fiscal Year Focus |  |  |  | 2017 |  |  |  |
Document Period End Date |  |  |  | Mar. 31, 2017 |  |  |  |
Net transfer In (Out) of Level 3 (a) | $ (2,400,000) | [1] |  | $ (29,500,000) | [2] |  |  |
Call options purchased to match the funding requirements |  |  |  | Call options are one, two and three year options |  |  |  |
FGL purchases call options to fund the next index credit |  |  |  | One, two or three year call options to fund the next index credit |  |  |  |
Spectrum Brands [Member] |  |  |  |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Estimated amount of derivative net losses/gains to be reclassified from AOCI into earnings over the next twelve months | 3,800,000 |  | $ 700,000 | $ 8,600,000 |  | $ 900,000 |  |
Spectrum Brands [Member] | Standby Letters of Credit [Member] |  |  |  |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Standby letters of credit | 0 |  |  | 0 |  |  |  | $ 0
Spectrum Brands [Member] | Silver Commodity Swap Contract [Member] |  |  |  |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Derivative Contracts Market Value | $ 200,000 |  |  | $ 200,000 |  |  | $ 600,000 |
Derivative, Nonmonetary Notional Amount | ozt | 10.4 |  |  | 10.4 |  |  | 31.0 |
Spectrum Brands [Member] | Foreign Exchange Contract [Member] |  |  |  |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Derivative Contracts Market Value | $ 252,900,000 |  |  | $ 252,900,000 |  |  | $ 224,800,000 |
Derivative net loss/gain |  |  |  | $ 1,300,000 |  |  |  |
Spectrum Brands [Member] | ERROR in label resolution. |  |  |  |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Weight Of Raw Material Under Derivative Contract | T |  |  |  | 6.8 |  |  | 6.7 |
Derivative Contracts Market Value | 15,700,000 |  |  | $ 15,700,000 |  |  | $ 12,800,000 |
Estimated amount of derivative net losses/gains to be reclassified from AOCI into earnings over the next twelve months |  |  |  | 1,500,000 |  |  |  |
Spectrum Brands [Member] | Foreign Exchange Forward [Member] |  |  |  |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Derivative Contracts Market Value | 202,400,000 |  |  | $ 202,400,000 |  |  | $ 131,400,000 |
Spectrum Brands [Member] | Bronze Commodity Contract [Member] |  |  |  |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Weight Of Raw Material Under Derivative Contract | T |  |  |  | 1.4 |  |  | 1.0 |
Derivative Contracts Market Value | 6,100,000 |  |  | $ 6,100,000 |  |  | $ 4,000,000 |
Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 32,700,000 |  |  | 32,700,000 |  |  | 25,900,000 |
Other assets [Member] | Not Designated as Hedging Instrument [Member] | Call options [Member] |  |  |  |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | $ 10,500,000 |  |  | $ 10,500,000 |  |  | $ 5,900,000 |
[1] | (a) During the three months ended March 31, 2017, the net transfer out of Level 3 was exclusively to Level 2.
[2] | (a) During the six months ended March 31, 2017, the net transfer out of Level 3 was exclusively to Level 2.

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