Shareholder Report, Holdings (Details)	Jan. 31, 2025
C000159046 [Member] | Prologis Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.20%	[1]
C000159046 [Member] | Equinix Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.90%	[1]
C000159046 [Member] | Welltower Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.70%	[1]
C000159046 [Member] | Simon Property Group Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.20%	[1]
C000159046 [Member] | Digital Realty Trust Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.00%	[1]
C000159046 [Member] | Realty Income Corp [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%	[1]
C000159046 [Member] | Public Storage [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%	[1]
C000159046 [Member] | Goodman Group [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%	[1]
C000159046 [Member] | Extra Space Storage Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.80%	[1]
C000159046 [Member] | AvalonBay Communities Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.80%	[1]
C000159046 [Member] | Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.50%	[2]
C000159046 [Member] | AUSTRALIA
Holdings [Line Items]
Percent of Net Asset Value	6.10%
C000159046 [Member] | CANADA
Holdings [Line Items]
Percent of Net Asset Value	1.90%
C000159046 [Member] | GERMANY
Holdings [Line Items]
Percent of Net Asset Value	2.00%
C000159046 [Member] | FRANCE
Holdings [Line Items]
Percent of Net Asset Value	1.50%
C000159046 [Member] | UNITED KINGDOM
Holdings [Line Items]
Percent of Net Asset Value	3.50%
C000159046 [Member] | HONG KONG
Holdings [Line Items]
Percent of Net Asset Value	2.30%
C000159046 [Member] | JAPAN
Holdings [Line Items]
Percent of Net Asset Value	8.80%
C000159046 [Member] | SWEDEN
Holdings [Line Items]
Percent of Net Asset Value	1.80%
C000159046 [Member] | SINGAPORE
Holdings [Line Items]
Percent of Net Asset Value	2.70%
C000159046 [Member] | UNITED STATES
Holdings [Line Items]
Percent of Net Asset Value	66.70%
C000159046 [Member] | Liabilities in Excess of Other Assets [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.80%)
C000159045 [Member] | Prologis Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.20%	[3]
C000159045 [Member] | Equinix Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.90%	[3]
C000159045 [Member] | Welltower Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.70%	[3]
C000159045 [Member] | Simon Property Group Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.20%	[3]
C000159045 [Member] | Digital Realty Trust Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.00%	[3]
C000159045 [Member] | Realty Income Corp [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%	[3]
C000159045 [Member] | Public Storage [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%	[3]
C000159045 [Member] | Goodman Group [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%	[3]
C000159045 [Member] | Extra Space Storage Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.80%	[3]
C000159045 [Member] | AvalonBay Communities Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.80%	[3]
C000159045 [Member] | Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.50%	[4]
C000159045 [Member] | AUSTRALIA
Holdings [Line Items]
Percent of Net Asset Value	6.10%
C000159045 [Member] | CANADA
Holdings [Line Items]
Percent of Net Asset Value	1.90%
C000159045 [Member] | GERMANY
Holdings [Line Items]
Percent of Net Asset Value	2.00%
C000159045 [Member] | FRANCE
Holdings [Line Items]
Percent of Net Asset Value	1.50%
C000159045 [Member] | UNITED KINGDOM
Holdings [Line Items]
Percent of Net Asset Value	3.50%
C000159045 [Member] | HONG KONG
Holdings [Line Items]
Percent of Net Asset Value	2.30%
C000159045 [Member] | JAPAN
Holdings [Line Items]
Percent of Net Asset Value	8.80%
C000159045 [Member] | SWEDEN
Holdings [Line Items]
Percent of Net Asset Value	1.80%
C000159045 [Member] | SINGAPORE
Holdings [Line Items]
Percent of Net Asset Value	2.70%
C000159045 [Member] | UNITED STATES
Holdings [Line Items]
Percent of Net Asset Value	66.70%
C000159045 [Member] | Liabilities in Excess of Other Assets [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.80%)
C000159047 [Member] | Prologis Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.20%	[5]
C000159047 [Member] | Equinix Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.90%	[5]
C000159047 [Member] | Welltower Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.70%	[5]
C000159047 [Member] | Simon Property Group Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.20%	[5]
C000159047 [Member] | Digital Realty Trust Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.00%	[5]
C000159047 [Member] | Realty Income Corp [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%	[5]
C000159047 [Member] | Public Storage [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%	[5]
C000159047 [Member] | Goodman Group [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%	[5]
C000159047 [Member] | Extra Space Storage Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.80%	[5]
C000159047 [Member] | AvalonBay Communities Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.80%	[5]
C000159047 [Member] | Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.50%	[6]
C000159047 [Member] | AUSTRALIA
Holdings [Line Items]
Percent of Net Asset Value	6.10%
C000159047 [Member] | CANADA
Holdings [Line Items]
Percent of Net Asset Value	1.90%
C000159047 [Member] | GERMANY
Holdings [Line Items]
Percent of Net Asset Value	2.00%
C000159047 [Member] | FRANCE
Holdings [Line Items]
Percent of Net Asset Value	1.50%
C000159047 [Member] | UNITED KINGDOM
Holdings [Line Items]
Percent of Net Asset Value	3.50%
C000159047 [Member] | HONG KONG
Holdings [Line Items]
Percent of Net Asset Value	2.30%
C000159047 [Member] | JAPAN
Holdings [Line Items]
Percent of Net Asset Value	8.80%
C000159047 [Member] | SWEDEN
Holdings [Line Items]
Percent of Net Asset Value	1.80%
C000159047 [Member] | SINGAPORE
Holdings [Line Items]
Percent of Net Asset Value	2.70%
C000159047 [Member] | UNITED STATES
Holdings [Line Items]
Percent of Net Asset Value	66.70%
C000159047 [Member] | Liabilities in Excess of Other Assets [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.80%)
C000253866 [Member] | Prologis Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.10%	[7]
C000253866 [Member] | Equinix Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.50%	[7]
C000253866 [Member] | Welltower Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.20%	[7]
C000253866 [Member] | Simon Property Group Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.10%	[7]
C000253866 [Member] | Digital Realty Trust Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.00%	[7]
C000253866 [Member] | Realty Income Corp [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.50%	[7]
C000253866 [Member] | Public Storage [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.50%	[7]
C000253866 [Member] | Extra Space Storage Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%	[7]
C000253866 [Member] | American Tower Corp [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.30%	[7]
C000253866 [Member] | Crown Castle Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.80%	[7]
C000253866 [Member] | Specialized REITs [Member]
Holdings [Line Items]
Percent of Net Asset Value	37.20%	[8]
C000253866 [Member] | Retail REITs [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.70%	[8]
C000253866 [Member] | Residential REITs [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.00%	[8]
C000253866 [Member] | Health Care REITs [Member]
Holdings [Line Items]
Percent of Net Asset Value	13.30%	[8]
C000253866 [Member] | Industrial REITs [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.90%	[8]
C000253866 [Member] | Office REITs [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.60%	[8]
C000253866 [Member] | Hotel And Resort REITs [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%	[8]
C000253866 [Member] | Diversified REITs [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.10%	[8]
C000253866 [Member] | Liabilities in Excess of Other Assets [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.10%)	[8]
C000253866 [Member] | Short-Term Investments [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.80%	[8]

[1] Excludes short-term securities.

[2] Ten largest countries/geographic regions are presented. Additional countries/geographic regions are found in Other.

[3] Excludes short-term securities.

[4] Ten largest countries/geographic regions are presented. Additional countries/geographic regions are found in Other.

[5] Excludes short-term securities.

[6] Ten largest countries/geographic regions are presented. Additional countries/geographic regions are found in Other.

[7] Excludes short-term securities.

[8] For purposes of this report, industry sub-classifications may differ from those utilized by the Fund for compliance purposes.