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Comparative Quarterly Financial Information (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
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Oct. 31, 2011
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Jul. 31, 2011
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Apr. 30, 2011
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Jan. 31, 2011
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Oct. 31, 2010
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Jul. 31, 2010
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Apr. 30, 2010
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Jan. 31, 2010
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Oct. 31, 2011
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Oct. 31, 2010
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Oct. 31, 2009
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| Quarterly Financial Data [Abstract] | |||||||||||
| Total revenues | $ 294,603 | $ 327,303 | $ 325,838 | $ 312,287 | $ 303,594 | $ 273,079 | $ 272,953 | $ 272,035 | $ 1,260,031 | $ 1,121,661 | $ 890,371 |
| Operating income | 101,928 | 115,674 | 117,037 | 103,018 | 106,084 | 78,762 | 81,089 | 87,347 | 437,657 | 353,282 | 233,220 |
| Net income attributable to Eaton Vance Corp. shareholders | $ 46,820 | $ 68,068 | $ 62,479 | $ 37,535 | $ 50,306 | $ 41,750 | $ 36,000 | $ 46,242 | $ 214,902 | $ 174,298 | $ 130,107 |
| Basic | $ 0.41 | $ 0.58 | $ 0.53 | $ 0.31 | $ 0.43 | $ 0.35 | $ 0.30 | $ 0.39 | $ 1.82 | $ 1.47 | $ 1.11 |
| Diluted | $ 0.40 | $ 0.55 | $ 0.50 | $ 0.30 | $ 0.41 | $ 0.34 | $ 0.29 | $ 0.37 | $ 1.75 | $ 1.40 | $ 1.07 |