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SELECTED PER SHARE DATA AND RATIOS (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2011 | Mar. 31, 2010 | Mar. 31, 2009
Per Share Data [Abstract] |  |  |  |  |  |  |  |  |  |
Investment income (in dollars per share) | $ 2.84 |  | $ 2.49 |  | $ 2.01 |  | $ 1.63 |  | $ 3.74 |
Operating expenses (in dollars per share) | $ (2.19) |  | $ (1.78) |  | $ (1.50) |  | $ (1.04) |  | $ (0.98) |
Interest expense (in dollars per share) | $ 0 |  | $ 0 |  | $ 0 |  | $ 0 |  | $ 0 |
Income taxes (in dollars per share) | $ (0.15) |  | $ (0.03) |  | $ (0.03) |  | $ (0.03) |  | $ (0.04) |
Net investment income (in dollars per share) | $ 0.50 |  | $ 0.68 |  | $ 0.48 |  | $ 0.56 |  | $ 2.72 |
Distributions from undistributed net investment income (in dollars per share) | $ (0.79) |  | $ (0.80) |  | $ (0.80) |  | $ (0.80) |  | $ (3.28) |
Net realized gain net of tax (in dollars per share) | $ 23.22 |  | $ 2.81 |  | $ 10.36 |  | $ 0.22 |  | $ 2.87 |
Dividends from capital gains (in dollars per share) | $ (20.29) |  | $ 0 |  | $ 0 |  | $ 0 |  | $ 0 |
Net increase (decrease) in unrealized appreciation of investments (in dollars per share) | $ 4.30 |  | $ 20.93 |  | $ 3.46 |  | $ 18.88 |  | $ (42.56) |
Exercise of employee stock options (in dollars per share) | $ (0.97) | [1] | $ (0.02) | [1] | $ (0.20) | [1] | $ 0 | [1] | $ 0 | [1]
Forfeiture/ (Issuance) of restricted stock (in dollars per share) | $ (0.41) | [2] |  |  |  |  |  |  |  |
Stock option expense (in dollars per share) | $ 0.14 |  | $ 0.28 |  | $ 0.26 |  | $ 0.18 |  | $ 0.13 |
Net change in pension plan funded status (in dollars per share | $ 0.05 |  | $ (0.11) |  | $ (0.02) |  | $ 0.12 |  | $ (0.39) |
Treasury stock (in dollars per share) | $ 0 | [3] | $ 0 | [3] | $ 0 | [3] | $ 0 | [3] | $ 1.40 | [3]
Adjustment to initially apply ASC 715, net of tax (in dollars per share) | $ 0 |  | $ 0 |  | $ 0 |  | $ 0 |  | $ 0 |
Increase (decrease) in net asset value (in dollars per share) | $ 5.75 |  | $ 23.77 |  | $ 13.54 |  | $ 19.16 |  | $ (39.11) |
Net asset value, Beginning of period (in dollars per share) | $ 167.45 |  | $ 143.68 |  | $ 130.14 |  | $ 110.98 |  | $ 150.09 |
Net asset value, End of period (in dollars per share) | $ 173.20 |  | $ 167.45 |  | $ 143.68 |  | $ 130.14 |  | $ 110.98 |
Ratios and Supplemental Data [Abstract] |  |  |  |  |  |  |  |  |  |
Ratio of operating expenses to average net assets (in hundredths) | 1.36% |  | 1.07% |  | 1.10% |  | 0.87% |  | 0.71% |
Ratio of net investment income to average net assets (in hundredths) | 0.31% |  | 0.41% |  | 0.35% |  | 0.47% |  | 1.96% |
Portfolio turnover rate (in hundredths) | 2.22% |  | 2.15% |  | 2.78% |  | 1.16% |  | 2.51% |
Net asset total return (in hundredths) | 27.00% |  | 18.07% |  | 18.40% |  | 18.50% |  | (22.56%) |
Shares outstanding at end of period (in shares) | 3,809 |  | 3,755 |  | 3,753 |  | 3,741 |  | 3,741 |
[1] | Net decrease is due to the exercise of employee stock options at prices less than beginning of period net asset value.
[2] | Reflects impact of the different share amounts as a result of issuance or forfeiture of restricted stock during the period.
[3] | Net increase is due to purchases of common stock at prices less than beginning period net asset value.

X
- Definition Changes in individual asset line items in the year-end statement of financial position that are incrementally affected by the recognition provisions of FAS 158 in the year of initial application on a per share basis. + References No definition available. + Details
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- Definition Refers to distributed net capital gains. + References No definition available. + Details
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- Definition Common stock purchased at the price set by the option (grant price), divided by shares outstanding. + References No definition available. + Details
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- Definition Refers to Forfeiture/ (Issuance) of restricted stock. + References No definition available. + Details
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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest divided by shares outstanding. + References No definition available. + Details
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- Definition The increase (decrease) during the reporting period in the aggregate amount of net assets from operations divided by shares outstanding. + References No definition available. + Details
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- Definition The interest expense per share during the period. + References No definition available. + Details
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- Definition Income from dividends, interest, and net realized short-term gains, adjusted for management fees and administrative expenses and divided by shares outstanding. + References No definition available. + Details
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- Definition Net asset total return. + References No definition available. + Details
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- Definition Net asset value per share. + References No definition available. + Details
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- Definition The net change in pension plan funded status on a per share basis. + References No definition available. + Details
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- Definition The increase (decrease) during the reporting period of the excess of the cost (face amount, notional amount) of an investment (security, contract) over its fair value which deficiency has not been recognized in earnings of the entity divided by shares outstanding. + References No definition available. + Details
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- Definition Income from dividends, interest, and net realized short-term gains, adjusted for management fees and administrative expenses and divided by shares outstanding. + References No definition available. + Details
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X
- Definition This item represents the gain (loss) realized during the period from the sale of investments net of tax and divided by shares outstanding. + References No definition available. + Details
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- Definition Generally recurring costs (per share) associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense. + References No definition available. + Details
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- Details
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- Definition Portfolio turnover rate. + References No definition available. + Details
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- Definition Ratio of net investment income to average net assets + References No definition available. + Details
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- Definition Ratio of operating expenses to average net assets. + References No definition available. + Details
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- Definition The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation divided by shares outstanding. + References No definition available. + Details
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- Definition This element represents a sum total of treasury stock not separately reflected on the income statement for the period divided by shares outstanding. + References No definition available. + Details
Name: | cswc_TreasuryStockExpensesPerShare
Namespace Prefix: | cswc_
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- Definition Undistributed net investment income during the reporting period and divided by shares outstanding. + References No definition available. + Details
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- Definition Number of shares issued and outstanding as of the balance sheet date. + References No definition available. + Details
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