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Shareholder Report, Line Graph (Details) - USD ($)
 12 Months Ended 60 Months Ended 115 Months Ended 120 Months Ended
Aug. 31, 2024
Aug. 31, 2024
Aug. 31, 2024
Aug. 31, 2024
Aug. 31, 2023
Aug. 31, 2022
Aug. 31, 2021
Aug. 31, 2020
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2015
Jan. 20, 2015
Aug. 31, 2014
C000015185 [Member]                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Class A Shares at maximum sales charge (Offering Price)                            
Account Value $ 12,690 $ 12,690 $ 12,690 $ 12,690 $ 11,428 $ 11,126 $ 12,397 $ 11,747 $ 11,148 $ 10,201 $ 10,262 $ 9,857 $ 9,269   $ 9,579
Average Annual Return, Percent 6.36% 1.74%   2.41%                      
C000015185 [Member] | Without Sales Load [Member]                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Class A Shares at NAV (excluding maximum sales charge)                            
Account Value $ 13,248 $ 13,248 13,248 $ 13,248 11,931 11,616 12,942 12,264 11,638 10,650 10,713 10,290 9,677   10,000
Average Annual Return, Percent 11.04% 2.63%   2.85%                      
C000015187 [Member] | Without Sales Load [Member]                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Class C Shares at NAV (excluding maximum sales charge)                            
Account Value $ 12,487 $ 12,487 12,487 $ 12,487 11,245 10,948 12,289 11,740 11,215 10,346 10,490 10,145 9,606   10,000
Average Annual Return, Percent 10.11% 1.87%   2.25%                      
C000151934 [Member]                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Class R6 Shares at NAV                            
Account Value $ 13,859 $ 13,859 $ 13,859 $ 13,859 12,455 12,081 13,416 12,671 11,976 10,923 10,952 10,477 9,820 $ 10,000  
Average Annual Return, Percent 11.28% 2.96% 3.45%                        
C000015189 [Member]                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Class I Shares at NAV                            
Account Value $ 13,589 $ 13,589 $ 13,589 $ 13,589 12,207 11,855 13,184 12,462 11,789 10,763 10,802 10,343 9,702   10,000
Average Annual Return, Percent 11.32% 2.88%   3.11%                      
C000015076 [Member]                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Class A Shares at maximum sales charge (Offering Price)                            
Account Value $ 13,181 $ 13,181 13,181 $ 13,181 11,524 10,784 12,014 10,872 10,907 10,388 10,026 9,003 8,607   9,524
Average Annual Return, Percent 8.90% 2.86%   2.80%                      
C000015076 [Member] | Without Sales Load [Member]                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Class A Shares at NAV (excluding maximum sales charge)                            
Account Value $ 13,841 $ 13,841 13,841 $ 13,841 12,101 11,323 12,615 11,416 11,452 10,908 10,527 9,453 9,037   10,000
Average Annual Return, Percent 14.38% 3.86%   3.30%                      
C000015078 [Member] | Without Sales Load [Member]                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Class C Shares at NAV (excluding maximum sales charge)                            
Account Value $ 13,032 $ 13,032 13,032 $ 13,032 11,394 10,661 11,972 10,928 11,031 10,587 10,297 9,313 8,975   10,000
Average Annual Return, Percent 13.57% 3.09%   2.68%                      
C000015080 [Member]                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Class I Shares at NAV                            
Account Value $ 14,166 $ 14,166 14,166 $ 14,166 12,354 11,529 12,827 11,583 11,606 11,014 10,607 9,506 9,064   10,000
Average Annual Return, Percent 14.67% 4.07%   3.54%                      
Bloomberg U S Aggregate Bond Index [Member]                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Bloomberg U.S. Aggregate Bond Index                            
Account Value $ 11,765 $ 11,765 11,765 $ 11,765 10,965 11,098 12,542 12,553 11,789 10,701 10,814 10,761 10,156 $ 10,000 10,000
Average Annual Return, Percent 7.30% (0.04%)   1.64%                      
Bloomberg U S Aggregate Bond C000151934 Index [Member]                              
Account Value [Line Items]                              
Account Value $ 11,473 $ 11,473 $ 11,473 $ 11,473 10,693 10,822 12,231 12,241 11,497 10,435 10,546 10,494 9,903    
Average Annual Return, Percent     1.44%                        
Lipper Multi Sector Income Funds Classification Average [Member]                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Lipper Multi-Sector Income Funds Classification Average                            
Average Annual Return, Percent 9.66% 1.94% 3.03% 2.80%                      
Bloomberg U S Corporate High Yield 2 Issuer Capped Bond Index [Member]                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Bloomberg U.S. Corporate High Yield 2% Issuer Capped Bond Index                            
Account Value $ 15,754 $ 15,754 $ 15,754 $ 15,754 $ 14,000 $ 13,062 $ 14,611 $ 13,267 $ 12,677 $ 11,897 $ 11,506 $ 10,592 $ 9,707   $ 10,000
Average Annual Return, Percent 12.53% 4.44%   4.65%                      
Lipper Global High Yield Funds Classification Average [Member]                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Lipper Global High Yield Funds Classification Average                            
Average Annual Return, Percent 12.05% 3.56%   3.61%