Acquisitions 1 (Details) - USD ($)
$ in Millions |
3 Months Ended |
6 Months Ended |
Jul. 31, 2017 |
Apr. 30, 2017 |
Jan. 31, 2017 |
Oct. 31, 2016 |
Jan. 31, 2016 |
Apr. 30, 2017 |
| Atlanta Capital [Member] |
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| Business Acquisition Contingent Consideration [Line Items] |
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| Company's increase in profit interest percentage under acquisition agreement, during the period |
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0.10%
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| Non-controlling interest holders total (direct and indirect) profits interest, end of period |
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13.10%
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13.00%
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13.10%
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| Profit interest granted to non-controlling interest holders under the Long-term Equity Incentive Plan |
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1.10%
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| Company's increase in indirect profit interest percentage under Long-term Equity Incentive Plan, during the period |
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0.90%
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| Purchase of non-controlling interests |
$ 0.4
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| Amount paid for indirect profit interest pursuant to the put and call provisions of the Long-term Equity Incentive Plan |
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$ 1.9
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| Parametric Portfolio Associates [Member] |
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| Business Acquisition Contingent Consideration [Line Items] |
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| Company's increase in capital interest percentage under acquisition agreement, during the period |
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0.50%
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0.50%
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| Company's increase in profit interest percentage under acquisition agreement, during the period |
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0.50%
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0.50%
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| Non-controlling interest holders capital ownership percentage, end of period |
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1.30%
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1.80%
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1.30%
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| Non-controlling interest holders total (direct and indirect) profits interest, end of period |
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6.40%
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7.00%
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6.40%
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| Company's increase in indirect profit interest percentage under Long-term Equity Incentive Plan, during the period |
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0.10%
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| Purchase of non-controlling interests |
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$ 6.9
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| Amount paid for indirect profit interest pursuant to the put and call provisions of the Long-term Equity Incentive Plan |
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$ 0.6
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| Parametric Portfolio Associates [Member] | Call Option [Member] |
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| Business Acquisition Contingent Consideration [Line Items] |
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| Purchase of non-controlling interests |
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$ 2.1
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| Parametric Portfolio Associates [Member] | Put Option [Member] |
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| Business Acquisition Contingent Consideration [Line Items] |
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| Purchase of non-controlling interests |
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$ 4.1
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| Tax Advantaged Bond Strategies [Member] |
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| Business Acquisition Contingent Consideration [Line Items] |
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| Goodwill acquired |
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$ 11.6
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