Shareholder Report, Average Annual Return (Details)

12 Months Ended

60 Months Ended

120 Months Ended

Dec. 31, 2025

Dec. 31, 2025

Dec. 31, 2025

C000130461 [Member]

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Class Y

Average Annual Return, Percent

4.69%

1.17%

2.81%

C000031763 [Member]

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Class I

Average Annual Return, Percent

4.63%

1.10%

2.75%

C000081695 [Member]

Average Annual Return [Line Items]

Line Graph and Table Measure Name

with Maximum Deferred Sales Charge - 1.00%

Average Annual Return, Percent

2.54%

^[1]

0.05%

1.68%

C000081694 [Member]

Average Annual Return [Line Items]

Line Graph and Table Measure Name

with Maximum Sales Charge - 4.50%

Average Annual Return, Percent

(0.40%)

(0.14%)

1.97%

Without Sales Load [Member] | C000081695 [Member]

Average Annual Return [Line Items]

Line Graph and Table Measure Name

without Deferred Sales Charge

Average Annual Return, Percent

3.54%

0.05%

1.68%

Without Sales Load [Member] | C000081694 [Member]

Average Annual Return [Line Items]

Line Graph and Table Measure Name

without Sales Charge

Average Annual Return, Percent

4.31%

0.79%

2.44%

Bloomberg Global Aggregate Index Hedged [Member]

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Bloomberg Global Aggregate Index (Hedged)

Average Annual Return, Percent

4.86%

0.34%

2.39%

[1]	The maximum contingent deferred sales charge for Class C shares is 1.00% for shares redeemed within one year of the date purchased.