000000 - Document - Document and Entity Information
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000011 - Document - Risk/Return Summary {Unlabeled} - Highland Floating Rate Opportunities Fund
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000012 - Schedule - Shareholder Fees {- Highland Floating Rate Opportunities Fund}
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000013 - Schedule - Annual Fund Operating Expenses {- Highland Floating Rate Opportunities Fund}
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000014 - Schedule - Expense Example {Transposed} {- Highland Floating Rate Opportunities Fund}
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000015 - Schedule - Expense Example, No Redemption {Transposed} {- Highland Floating Rate Opportunities Fund}
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000016 - Schedule - Annual Total Returns - Highland Floating Rate Opportunities Fund [BarChart]
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000017 - Schedule - Average Annual Total Returns {Transposed} {- Highland Floating Rate Opportunities Fund}
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000018 - Document - Risk/Return Detail {Unlabeled} - Highland Floating Rate Opportunities Fund
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000019 - Disclosure - Risk/Return Detail Data {Elements} - Highland Floating Rate Opportunities Fund
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000021 - Document - Risk/Return Summary {Unlabeled} - Highland Long/Short Equity Fund
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000022 - Schedule - Shareholder Fees {- Highland Long/Short Equity Fund}
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000023 - Schedule - Annual Fund Operating Expenses {- Highland Long/Short Equity Fund}
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000024 - Schedule - Expense Example {Transposed} {- Highland Long/Short Equity Fund}
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000025 - Schedule - Expense Example, No Redemption {Transposed} {- Highland Long/Short Equity Fund}
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000026 - Schedule - Annual Total Returns - Highland Long/Short Equity Fund [BarChart]
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000027 - Schedule - Average Annual Total Returns {Transposed} {- Highland Long/Short Equity Fund}
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000028 - Document - Risk/Return Detail {Unlabeled} - Highland Long/Short Equity Fund
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000029 - Disclosure - Risk/Return Detail Data {Elements} - Highland Long/Short Equity Fund
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000031 - Document - Risk/Return Summary {Unlabeled} - Highland Long/Short Healthcare Fund
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000032 - Schedule - Shareholder Fees {- Highland Long/Short Healthcare Fund}
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000033 - Schedule - Annual Fund Operating Expenses {- Highland Long/Short Healthcare Fund}
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000034 - Schedule - Expense Example {Transposed} {- Highland Long/Short Healthcare Fund}
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000035 - Schedule - Expense Example, No Redemption {Transposed} {- Highland Long/Short Healthcare Fund}
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000036 - Schedule - Annual Total Returns - Highland Long/Short Healthcare Fund [BarChart]
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000037 - Schedule - Average Annual Total Returns {Transposed} {- Highland Long/Short Healthcare Fund}
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000038 - Document - Risk/Return Detail {Unlabeled} - Highland Long/Short Healthcare Fund
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000039 - Disclosure - Risk/Return Detail Data {Elements} - Highland Long/Short Healthcare Fund
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