|
Note 6 - Investment in Westinghouse and Related Agreements (Detail)
|
0 Months Ended | 3 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|---|
|
Oct. 16, 2006
USD ($)
|
Nov. 30, 2011
USD ($)
|
Aug. 31, 2011
USD ($)
|
Oct. 31, 2007
JPY (¥)
|
Oct. 13, 2006
USD ($)
|
Oct. 13, 2006
JPY (¥)
|
Oct. 16, 2006
Toshiba Nuclear Energy Holdings Inc [Member]
|
Nov. 30, 2011
Principal [Member]
USD ($)
|
Nov. 30, 2011
Interest [Member]
USD ($)
|
|
| Equity Method Investment, Ownership Percentage | 20.00% | 20.00% | |||||||
| Business Acquisition, Cost of Acquired Entity, Purchase Price | $ 1,100,000,000 | $ 1,100,000,000 | |||||||
| Debt Instrument, Face Amount (in Yen) | 128,980,000,000 | 1,100,000,000 | 128,980,000,000 | ||||||
| Proceeds from Issuance of Debt | 1,000,000,000 | 1,000,000,000 | |||||||
| Letters of Credit Outstanding, Amount | $ 431,800,000 | $ 456,100,000 | $ 55,100,000 | $ 57,700,000 | |||||