Shareholder Report, Holdings (Details)
|
Jun. 30, 2025 |
| C000099785 | American Tower Corp. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
10.50%
|
| C000099785 | Prologis, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
6.90%
|
| C000099785 | Welltower, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
6.90%
|
| C000099785 | Equinix, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
6.40%
|
| C000099785 | Public Storage |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
5.20%
|
| C000099785 | Iron Mountain, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
5.00%
|
| C000099785 | Digital Realty Trust, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
4.40%
|
| C000099785 | Simon Property Group, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
4.10%
|
| C000099785 | Mid-America Apartment Communities, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.70%
|
| C000099785 | Agree Realty Corp. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.60%
|
| C000099785 | IndustrySpecialized REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
42.00%
|
| C000099785 | IndustryResidential REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
17.00%
|
| C000099785 | IndustryHealth Care REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
14.00%
|
| C000099785 | IndustryRetail REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
12.00%
|
| C000099785 | IndustryIndustrial REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
11.00%
|
| C000099785 | IndustryDiversified REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.00%
|
| C000099785 | IndustryOffice REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
1.00%
|
| C000099785 | AssetCommon Stocks |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
99.00%
|
| C000099785 | AssetCash Equivalents |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
1.00%
|
| C000099785 | Asset Other Net Line |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
0.00%
|
| C000099787 | American Tower Corp. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
10.50%
|
| C000099787 | Prologis, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
6.90%
|
| C000099787 | Welltower, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
6.90%
|
| C000099787 | Equinix, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
6.40%
|
| C000099787 | Public Storage |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
5.20%
|
| C000099787 | Iron Mountain, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
5.00%
|
| C000099787 | Digital Realty Trust, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
4.40%
|
| C000099787 | Simon Property Group, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
4.10%
|
| C000099787 | Mid-America Apartment Communities, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.70%
|
| C000099787 | Agree Realty Corp. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.60%
|
| C000099787 | IndustrySpecialized REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
42.00%
|
| C000099787 | IndustryResidential REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
17.00%
|
| C000099787 | IndustryHealth Care REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
14.00%
|
| C000099787 | IndustryRetail REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
12.00%
|
| C000099787 | IndustryIndustrial REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
11.00%
|
| C000099787 | IndustryDiversified REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.00%
|
| C000099787 | IndustryOffice REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
1.00%
|
| C000099787 | AssetCommon Stocks |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
99.00%
|
| C000099787 | AssetCash Equivalents |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
1.00%
|
| C000099787 | Asset Other Net Line |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
0.00%
|
| C000099788 | American Tower Corp. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
10.50%
|
| C000099788 | Prologis, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
6.90%
|
| C000099788 | Welltower, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
6.90%
|
| C000099788 | Equinix, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
6.40%
|
| C000099788 | Public Storage |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
5.20%
|
| C000099788 | Iron Mountain, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
5.00%
|
| C000099788 | Digital Realty Trust, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
4.40%
|
| C000099788 | Simon Property Group, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
4.10%
|
| C000099788 | Mid-America Apartment Communities, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.70%
|
| C000099788 | Agree Realty Corp. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.60%
|
| C000099788 | IndustrySpecialized REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
42.00%
|
| C000099788 | IndustryResidential REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
17.00%
|
| C000099788 | IndustryHealth Care REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
14.00%
|
| C000099788 | IndustryRetail REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
12.00%
|
| C000099788 | IndustryIndustrial REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
11.00%
|
| C000099788 | IndustryDiversified REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.00%
|
| C000099788 | IndustryOffice REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
1.00%
|
| C000099788 | AssetCommon Stocks |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
99.00%
|
| C000099788 | AssetCash Equivalents |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
1.00%
|
| C000099788 | Asset Other Net Line |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
0.00%
|
| C000148175 | American Tower Corp. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
10.50%
|
| C000148175 | Prologis, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
6.90%
|
| C000148175 | Welltower, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
6.90%
|
| C000148175 | Equinix, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
6.40%
|
| C000148175 | Public Storage |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
5.20%
|
| C000148175 | Iron Mountain, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
5.00%
|
| C000148175 | Digital Realty Trust, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
4.40%
|
| C000148175 | Simon Property Group, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
4.10%
|
| C000148175 | Mid-America Apartment Communities, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.70%
|
| C000148175 | Agree Realty Corp. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.60%
|
| C000148175 | IndustrySpecialized REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
42.00%
|
| C000148175 | IndustryResidential REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
17.00%
|
| C000148175 | IndustryHealth Care REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
14.00%
|
| C000148175 | IndustryRetail REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
12.00%
|
| C000148175 | IndustryIndustrial REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
11.00%
|
| C000148175 | IndustryDiversified REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.00%
|
| C000148175 | IndustryOffice REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
1.00%
|
| C000148175 | AssetCommon Stocks |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
99.00%
|
| C000148175 | AssetCash Equivalents |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
1.00%
|
| C000148175 | Asset Other Net Line |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
0.00%
|
| C000099789 | American Tower Corp. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
10.50%
|
| C000099789 | Prologis, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
6.90%
|
| C000099789 | Welltower, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
6.90%
|
| C000099789 | Equinix, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
6.40%
|
| C000099789 | Public Storage |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
5.20%
|
| C000099789 | Iron Mountain, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
5.00%
|
| C000099789 | Digital Realty Trust, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
4.40%
|
| C000099789 | Simon Property Group, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
4.10%
|
| C000099789 | Mid-America Apartment Communities, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.70%
|
| C000099789 | Agree Realty Corp. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.60%
|
| C000099789 | IndustrySpecialized REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
42.00%
|
| C000099789 | IndustryResidential REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
17.00%
|
| C000099789 | IndustryHealth Care REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
14.00%
|
| C000099789 | IndustryRetail REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
12.00%
|
| C000099789 | IndustryIndustrial REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
11.00%
|
| C000099789 | IndustryDiversified REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.00%
|
| C000099789 | IndustryOffice REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
1.00%
|
| C000099789 | AssetCommon Stocks |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
99.00%
|
| C000099789 | AssetCash Equivalents |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
1.00%
|
| C000099789 | Asset Other Net Line |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
0.00%
|
| C000099790 | American Tower Corp. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
10.50%
|
| C000099790 | Prologis, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
6.90%
|
| C000099790 | Welltower, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
6.90%
|
| C000099790 | Equinix, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
6.40%
|
| C000099790 | Public Storage |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
5.20%
|
| C000099790 | Iron Mountain, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
5.00%
|
| C000099790 | Digital Realty Trust, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
4.40%
|
| C000099790 | Simon Property Group, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
4.10%
|
| C000099790 | Mid-America Apartment Communities, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.70%
|
| C000099790 | Agree Realty Corp. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.60%
|
| C000099790 | IndustrySpecialized REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
42.00%
|
| C000099790 | IndustryResidential REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
17.00%
|
| C000099790 | IndustryHealth Care REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
14.00%
|
| C000099790 | IndustryRetail REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
12.00%
|
| C000099790 | IndustryIndustrial REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
11.00%
|
| C000099790 | IndustryDiversified REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.00%
|
| C000099790 | IndustryOffice REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
1.00%
|
| C000099790 | AssetCommon Stocks |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
99.00%
|
| C000099790 | AssetCash Equivalents |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
1.00%
|
| C000099790 | Asset Other Net Line |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
0.00%
|