v3.25.1
Shareholder Report, Holdings (Details)
Feb. 28, 2025
C000000397 [Member] | One to 7 [Member]  
Holdings [Line Items]  
Percent of Total Investments 51.10% [1]
C000000397 [Member] | Eight to 30 [Member]  
Holdings [Line Items]  
Percent of Total Investments 5.80% [1]
C000000397 [Member] | Thirty One to 60 [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.90% [1]
C000000397 [Member] | Sixty One to 90 [Member]  
Holdings [Line Items]  
Percent of Total Investments 4.40% [1]
C000000397 [Member] | Ninety One To 180 [Member]  
Holdings [Line Items]  
Percent of Total Investments 16.70% [1]
C000000397 [Member] | One Hundred Eighty One Plus [Member]  
Holdings [Line Items]  
Percent of Total Investments 12.10% [1]
C000029748 [Member] | One to 7 [Member]  
Holdings [Line Items]  
Percent of Total Investments 51.10% [2]
C000029748 [Member] | Eight to 30 [Member]  
Holdings [Line Items]  
Percent of Total Investments 5.80% [2]
C000029748 [Member] | Thirty One to 60 [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.90% [2]
C000029748 [Member] | Sixty One to 90 [Member]  
Holdings [Line Items]  
Percent of Total Investments 4.40% [2]
C000029748 [Member] | Ninety One To 180 [Member]  
Holdings [Line Items]  
Percent of Total Investments 16.70% [2]
C000029748 [Member] | One Hundred Eighty One Plus [Member]  
Holdings [Line Items]  
Percent of Total Investments 12.10% [2]
C000173346 [Member] | One to 7 [Member]  
Holdings [Line Items]  
Percent of Total Investments 51.10% [3]
C000173346 [Member] | Eight to 30 [Member]  
Holdings [Line Items]  
Percent of Total Investments 5.80% [3]
C000173346 [Member] | Thirty One to 60 [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.90% [3]
C000173346 [Member] | Sixty One to 90 [Member]  
Holdings [Line Items]  
Percent of Total Investments 4.40% [3]
C000173346 [Member] | Ninety One To 180 [Member]  
Holdings [Line Items]  
Percent of Total Investments 16.70% [3]
C000173346 [Member] | One Hundred Eighty One Plus [Member]  
Holdings [Line Items]  
Percent of Total Investments 12.10% [3]
C000173345 [Member] | One to 7 [Member]  
Holdings [Line Items]  
Percent of Total Investments 51.10% [4]
C000173345 [Member] | Eight to 30 [Member]  
Holdings [Line Items]  
Percent of Total Investments 5.80% [4]
C000173345 [Member] | Thirty One to 60 [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.90% [4]
C000173345 [Member] | Sixty One to 90 [Member]  
Holdings [Line Items]  
Percent of Total Investments 4.40% [4]
C000173345 [Member] | Ninety One To 180 [Member]  
Holdings [Line Items]  
Percent of Total Investments 16.70% [4]
C000173345 [Member] | One Hundred Eighty One Plus [Member]  
Holdings [Line Items]  
Percent of Total Investments 12.10% [4]
C000173347 [Member] | One to 7 [Member]  
Holdings [Line Items]  
Percent of Total Investments 51.10% [5]
C000173347 [Member] | Eight to 30 [Member]  
Holdings [Line Items]  
Percent of Total Investments 5.80% [5]
C000173347 [Member] | Thirty One to 60 [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.90% [5]
C000173347 [Member] | Sixty One to 90 [Member]  
Holdings [Line Items]  
Percent of Total Investments 4.40% [5]
C000173347 [Member] | Ninety One To 180 [Member]  
Holdings [Line Items]  
Percent of Total Investments 16.70% [5]
C000173347 [Member] | One Hundred Eighty One Plus [Member]  
Holdings [Line Items]  
Percent of Total Investments 12.10% [5]
C000173348 [Member] | One to 7 [Member]  
Holdings [Line Items]  
Percent of Total Investments 51.10% [6]
C000173348 [Member] | Eight to 30 [Member]  
Holdings [Line Items]  
Percent of Total Investments 5.80% [6]
C000173348 [Member] | Thirty One to 60 [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.90% [6]
C000173348 [Member] | Sixty One to 90 [Member]  
Holdings [Line Items]  
Percent of Total Investments 4.40% [6]
C000173348 [Member] | Ninety One To 180 [Member]  
Holdings [Line Items]  
Percent of Total Investments 16.70% [6]
C000173348 [Member] | One Hundred Eighty One Plus [Member]  
Holdings [Line Items]  
Percent of Total Investments 12.10% [6]
C000029750 [Member] | One to 7 [Member]  
Holdings [Line Items]  
Percent of Total Investments 67.10% [7]
C000029750 [Member] | Eight to 30 [Member]  
Holdings [Line Items]  
Percent of Total Investments 0.50% [7]
C000029750 [Member] | Thirty One to 60 [Member]  
Holdings [Line Items]  
Percent of Total Investments 4.40% [7]
C000029750 [Member] | Sixty One to 90 [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.70% [7]
C000029750 [Member] | Ninety One To 180 [Member]  
Holdings [Line Items]  
Percent of Total Investments 6.40% [7]
C000029750 [Member] | One Hundred Eighty One Plus [Member]  
Holdings [Line Items]  
Percent of Total Investments 18.90% [7]
C000000400 [Member] | One to 7 [Member]  
Holdings [Line Items]  
Percent of Total Investments 67.10% [8]
C000000400 [Member] | Eight to 30 [Member]  
Holdings [Line Items]  
Percent of Total Investments 0.50% [8]
C000000400 [Member] | Thirty One to 60 [Member]  
Holdings [Line Items]  
Percent of Total Investments 4.40% [8]
C000000400 [Member] | Sixty One to 90 [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.70% [8]
C000000400 [Member] | Ninety One To 180 [Member]  
Holdings [Line Items]  
Percent of Total Investments 6.40% [8]
C000000400 [Member] | One Hundred Eighty One Plus [Member]  
Holdings [Line Items]  
Percent of Total Investments 18.90% [8]
[1] The number of days to maturity of each holding is determined in accordance with the provisions of Rule 2a-7 under the Investment Company Act of 1940.
[2] The number of days to maturity of each holding is determined in accordance with the provisions of Rule 2a-7 under the Investment Company Act of 1940.
[3] The number of days to maturity of each holding is determined in accordance with the provisions of Rule 2a-7 under the Investment Company Act of 1940.
[4] The number of days to maturity of each holding is determined in accordance with the provisions of Rule 2a-7 under the Investment Company Act of 1940.
[5] The number of days to maturity of each holding is determined in accordance with the provisions of Rule 2a-7 under the Investment Company Act of 1940.
[6] The number of days to maturity of each holding is determined in accordance with the provisions of Rule 2a-7 under the Investment Company Act of 1940.
[7] The number of days to maturity of each holding is determined in accordance with the provisions of Rule 2a-7 under the Investment Company Act of 1940.
[8] The number of days to maturity of each holding is determined in accordance with the provisions of Rule 2a-7 under the Investment Company Act of 1940.