Shareholder Report, Line Graph (Details) - USD ($) |
6 Months Ended | 11 Months Ended | 12 Months Ended | 18 Months Ended | 23 Months Ended | 24 Months Ended | 30 Months Ended | 35 Months Ended | 36 Months Ended | 42 Months Ended | 47 Months Ended | 48 Months Ended | 54 Months Ended | 59 Months Ended | 60 Months Ended | 66 Months Ended | 72 Months Ended | 78 Months Ended | 84 Months Ended | 90 Months Ended | 96 Months Ended | 108 Months Ended | 120 Months Ended | ||||
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Aug. 31, 2021 |
Jan. 31, 2019 |
Jul. 31, 2016 |
Jul. 31, 2019 |
Jul. 31, 2022 |
Jul. 31, 2026 |
Jul. 31, 2017 |
Jul. 31, 2020 |
Jul. 31, 2023 |
Jul. 31, 2018 |
Jul. 31, 2021 |
Jul. 31, 2024 |
Jul. 31, 2019 |
Jul. 31, 2022 |
Jul. 31, 2025 |
Jul. 31, 2020 |
Jul. 31, 2023 |
Jul. 31, 2026 |
Jul. 31, 2021 |
Jul. 31, 2024 |
Jul. 31, 2022 |
Jul. 31, 2025 |
Jul. 31, 2023 |
Jul. 31, 2026 |
Jul. 31, 2024 |
Jul. 31, 2025 |
Jul. 31, 2026 |
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| C000211235 [Member] | |||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Nomura Corporate Bond Fund (Class R6) – including sales charge | ||||||||||||||||||||||||||
| Accumulated Value | $ 10,000 | $ 10,888.1 | $ 12,318.24 | $ 12,693.52 | $ 10,944.48 | $ 10,757.79 | $ 11,485.35 | $ 11,997.85 | $ 12,255.91 | ||||||||||||||||||
| C000011005 [Member] | |||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Nomura Corporate Bond Fund (Institutional Class) – including sales charge | ||||||||||||||||||||||||||
| Accumulated Value | $ 10,000 | $ 10,300.2 | $ 10,175.97 | $ 11,289.19 | $ 12,779.02 | $ 13,135.99 | $ 11,337.35 | $ 11,120.7 | $ 11,859.72 | $ 12,376.75 | $ 12,632.7 | ||||||||||||||||
| C000011004 [Member] | |||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Nomura Corporate Bond Fund (Class R) – including sales charge | ||||||||||||||||||||||||||
| Accumulated Value | 10,000 | 10,250.22 | 10,094.03 | 11,141.48 | 12,527.87 | 12,832.02 | 11,002.43 | 10,746.19 | 11,410.57 | 11,849 | 12,034.25 | ||||||||||||||||
| C000011003 [Member] | |||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Nomura Corporate Bond Fund (Class C) – including sales charge | ||||||||||||||||||||||||||
| Accumulated Value | 10,000 | 10,200.62 | 9,977.22 | 10,959.09 | 12,281.98 | 12,496.63 | 10,677.95 | 10,371.16 | 10,957.87 | 11,322.37 | 11,441.85 | ||||||||||||||||
| C000011001 [Member] | |||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Nomura Corporate Bond Fund (Class A) – including sales charge | ||||||||||||||||||||||||||
| Accumulated Value | 9,549.84 | 9,812.6 | 9,670.05 | 10,701.39 | 12,083.53 | 12,389.38 | 10,666.22 | 10,436.73 | 11,102.68 | 11,557.94 | 11,767.58 | ||||||||||||||||
| C000011010 [Member] | |||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Nomura Extended Duration Bond Fund (Class A) – including sales charge | ||||||||||||||||||||||||||
| Accumulated Value | 9,549.93 | 9,634.06 | 9,475.01 | 10,723.54 | 12,782.92 | 12,950.67 | 10,351.79 | 9,821.88 | 10,283.8 | 10,416.5 | 10,435.9 | ||||||||||||||||
| C000011012 [Member] | |||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Nomura Extended Duration Bond Fund (Class C) – including sales charge | ||||||||||||||||||||||||||
| Accumulated Value | 10,000 | 10,014.44 | 9,774.43 | 10,981.88 | 12,995.51 | 13,083.34 | 10,380.01 | 9,762.34 | 10,152.33 | 10,206.69 | 10,148.95 | ||||||||||||||||
| C000011013 [Member] | |||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Nomura Extended Duration Bond Fund (Class R) – including sales charge | ||||||||||||||||||||||||||
| Accumulated Value | 10,000 | 10,063.56 | 9,873.42 | 11,145.27 | 13,249.51 | 13,408.1 | 10,680.06 | 10,103.17 | 10,559.22 | 10,669.63 | 10,663.95 | ||||||||||||||||
| C000011014 [Member] | |||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Nomura Extended Duration Bond Fund (Institutional Class) – including sales charge | ||||||||||||||||||||||||||
| Accumulated Value | 10,000 | 10,127.11 | 9,984.09 | 11,329.3 | 13,523.92 | 13,755.13 | 11,018.38 | 10,478.2 | 10,998.28 | 11,167.07 | 11,223.02 | ||||||||||||||||
| C000169262 [Member] | |||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Nomura Extended Duration Bond Fund (Class R6) – including sales charge | ||||||||||||||||||||||||||
| Accumulated Value | 10,000 | 10,119.69 | 9,984.84 | 11,339.41 | 13,563.72 | 13,788.49 | 11,054.52 | 10,529.93 | 11,064.07 | 11,245.54 | 11,312.09 | ||||||||||||||||
| C000228679 [Member] | |||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Nomura Floating Rate Fund (Class R6) – including sales charge | ||||||||||||||||||||||||||
| Accumulated Value | $ 10,000 | $ 9,931.03 | $ 10,773.39 | $ 11,909.31 | $ 12,806.5 | $ 13,495.09 | |||||||||||||||||||||
| C000085184 [Member] | |||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Nomura Floating Rate Fund (Institutional Class) – including sales charge | ||||||||||||||||||||||||||
| Accumulated Value | 10,000 | 10,400.05 | 10,823.13 | 11,347.41 | 11,348.49 | 12,347.95 | 12,309.1 | 13,327.04 | 14,720.62 | 15,838.79 | 16,655.68 | ||||||||||||||||
| C000085183 [Member] | |||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Nomura Floating Rate Fund (Class R) – including sales charge | ||||||||||||||||||||||||||
| Accumulated Value | 10,000 | 10,350.04 | 10,717.57 | 11,180.97 | 11,126.18 | 12,043.13 | 11,931.85 | 12,870.53 | 14,145.68 | 15,125.76 | 15,846.7 | ||||||||||||||||
| C000085182 [Member] | |||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Nomura Floating Rate Fund (Class C) – including sales charge | ||||||||||||||||||||||||||
| Accumulated Value | 10,000 | 10,300.21 | 10,613.05 | 11,016.95 | 10,908.19 | 11,748.5 | 11,595.3 | 12,429.82 | 13,593.91 | 14,481.95 | 15,077.95 | ||||||||||||||||
| C000085181 [Member] | |||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Nomura Floating Rate Fund (Class A) – including sales charge | ||||||||||||||||||||||||||
| Accumulated Value | 9,725 | 10,094.92 | 10,479.52 | 10,959.77 | 10,933.59 | 11,866.16 | 11,799.83 | 12,744.11 | 14,041.69 | 15,070.82 | 15,808.75 | ||||||||||||||||
| Bloomberg US Corporate Bond Index [Member] | |||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg US Corporate Bond Index | ||||||||||||||||||||||||||
| Accumulated Value | 10,000 | 10,000 | 10,792.7512 | 10,154.53929 | 12,134.8602 | 10,080.50393 | 12,307.3952 | 11,130.80913 | 10,755.4768 | 12,514.95649 | 10,616.0809 | 12,692.89579 | 11,333.7899 | 11,092.36715 | 11,842.2458 | 10,948.60494 | 12,141.6469 | 11,688.79458 | 12,213.17661 | 12,521.9558 | |||||||
| Bloomberg US Aggregate Index [Member] | |||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg US Aggregate Index | ||||||||||||||||||||||||||
| Accumulated Value | 10,000 | $ 10,000 | 10,000 | $ 10,522.905 | 9,105.7026 | 9,948.524637 | $ 11,587.9525 | 8,799.0324 | 9,868.925934 | $ 11,506.6326 | 9,247.8774 | 10,666.41351 | $ 10,457.6485 | 9,560.6171 | 11,745.98574 | $ 10,105.4461 | 9,819.67 | 11,663.55685 | $ 10,620.9322 | 10,600.26697 | $ 10,980.1052 | 10,243.26142 | $ 11,277.6203 | 10,765.77765 | 11,129.84882 | 11,431.42134 | |
| Bloomberg Long US Corporate Index [Member] | |||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Long US Corporate Index | ||||||||||||||||||||||||||
| Accumulated Value | 10,000 | 10,128.80093 | 10,044.21414 | 11,515.50302 | 13,750.41347 | 13,846.13195 | 11,106.61198 | 10,686.43143 | 11,280.41598 | 11,493.50129 | 11,578.41784 | ||||||||||||||||
| Morningstar LSTA US Leveraged Loan Index [Member] | |||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Morningstar LSTA US Leveraged Loan Index | ||||||||||||||||||||||||||
| Accumulated Value | $ 10,000 | $ 10,000 | $ 9,883.2194 | $ 10,663.79072 | $ 10,850.7314 | $ 11,134.97572 | $ 11,984.7415 | $ 11,583.74778 | $ 12,883.051 | $ 11,483.22249 | $ 13,434.468 | $ 12,573.46261 | $ 12,485.64087 | $ 13,707.91531 | $ 15,140.52984 | $ 16,275.37958 | $ 16,971.99417 | ||||||||||