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SUMMARY OF PER SHARE INFORMATION (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011
SUMMARY OF PER SHARE INFORMATION [Abstract] |  |  |  |  |  |  |  |
Investment income (in dollars per share) | $ 1.84 |  | $ 1.50 |  | $ 2.57 |  | $ 2.15 |
Operating expenses (in dollars per share) | $ (0.74) |  | $ (0.32) |  | $ (1.5) |  | $ (0.96) |
Income taxes (in dollars per share) | $ (0.01) |  | $ (0.01) |  | $ (0.01) |  | $ (0.01) |
Net investment income (in dollars per share) | $ 1.09 |  | $ 1.17 |  | $ 1.06 |  | $ 1.18 |
Distributions from undistributed net investment income (in dollars per share) | $ (0.4) |  | $ (0.4) |  | $ (0.8) |  | $ (0.8) |
Net realized gain/(loss) net of tax (in dollars per share) | $ 0.17 |  | $ (0.64) |  | $ 17.78 |  | $ 2.68 |
Net increase (decrease) in unrealized appreciation of investments (in dollars per share) | $ 5.87 |  | $ 13.00 |  | $ (1.56) |  | $ 0.04 |
Dividends from capital gains (in dollars per share) | $ 0 |  |  |  | $ (17.59) |  |  |
Exercise of employee stock options (in dollars per share) | $ (0.04) |  | $ 0 |  | $ (0.76) |  | $ (0.03) |
Stock option expense (in dollars per share) | $ 0.02 |  | $ 0.07 |  | $ 0.09 |  | $ 0.20 |
Other (in dollars per share) | $ 0 | [1] | $ 0 | [1] | $ (0.31) | [1] | $ 0 | [1]
Increase (decrease) in net asset value (in dollars per share) | $ 6.71 |  | $ 13.20 |  | $ (2.09) |  | $ 3.27 |
Net asset value, Beginning of period (in dollars per share) | $ 158.65 |  | $ 133.75 |  | $ 167.45 |  | $ 143.68 |
Net asset value, End of period (in dollars per share) | $ 165.36 |  | $ 146.95 |  | $ 165.36 |  | $ 146.95 |
[1] | Reflects impact of the different share amounts as a result of issuance or forfeiture of restricted stock during the period.

X
- Definition Refers to distributed net capital gains. + References No definition available. + Details
Name: | cswc_DividendsFromCapitalGains
Namespace Prefix: | cswc_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Common stock purchased at the price set by the option (grant price), divided by shares outstanding. + References No definition available. + Details
Name: | cswc_ExerciseOfEmployeeStockOptionsPerShare
Namespace Prefix: | cswc_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | cswc_IncomeTaxesPerShare
Namespace Prefix: | cswc_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | cswc_IncreaseDecreaseInNetAssetValuePerShare
Namespace Prefix: | cswc_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | cswc_InvestmentIncome
Namespace Prefix: | cswc_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Net asset value per share as of the balance sheet date. + References No definition available. + Details
Name: | cswc_NetAssetValuePerShare
Namespace Prefix: | cswc_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- 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
Name: | cswc_NetIncreaseDecreaseInUnrealizedAppreciationOfInvestmentsPerShare
Namespace Prefix: | cswc_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | cswc_NetInvestmentIncomePerShare
Namespace Prefix: | cswc_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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
Name: | cswc_NetRealizedGainLossNetOfTaxPerShare
Namespace Prefix: | cswc_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | cswc_OperatingExpensesPerShare
Namespace Prefix: | cswc_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents a sum total of expenses not separately reflected on the income statement for the period divided by shares outstanding. + References No definition available. + Details
Name: | cswc_OtherExpensesPerShare
Namespace Prefix: | cswc_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | cswc_StockOptionExpensePerShare
Namespace Prefix: | cswc_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Undistributed net investment income during the reporting period and divided by shares outstanding. + References No definition available. + Details
Name: | cswc_UndistributedNetInvestmentIncomePerShare
Namespace Prefix: | cswc_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_EarningsPerShareAbstract
Namespace Prefix: | us-gaap_
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