3.26.1 html 352 39 1 false 93 0 false 3 false false R1.htm 030000 - Disclosure - Form N-CSR Cover Sheet http://xbrl.sec.gov/oef/role/NcsrCover Form N-CSR Cover Cover 1 false false R2.htm 030001 - Disclosure - Shareholder Report Sheet http://xbrl.sec.gov/oef/role/ShareholderReport Shareholder Report Notes 2 false false R3.htm 040010 - Disclosure - Shareholder Report, Line Graph (Details) Sheet http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails Shareholder Report, Line Graph (Details) Details 3 false false R4.htm 040015 - Disclosure - Shareholder Report, Average Annual Return (Details) Sheet http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails Shareholder Report, Average Annual Return (Details) Details 4 false false R5.htm 040020 - Disclosure - Shareholder Report, Holdings (Details) Sheet http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails Shareholder Report, Holdings (Details) Details 5 false false All Reports Book All Reports bw-20260630.xsd d138030dncsr.htm g138030g01a01.jpg g138030g02a01.jpg g138030g02g02.jpg g138030g87a01.jpg g138030i1eca240e2927cb7da917.jpg g138030i1f6bc74b1f886c243be8.jpg g138030i340bc80cb8b83951f3ed.jpg g138030i3533dbb2d5f8d3dab622.jpg g138030i36ca7ccf304c03afc19a.jpg g138030i47ee1a676f58ea498ad3.jpg g138030i4b5c1c9ed3a47407b6ca.jpg g138030i6120e7db4b1e8c2c5e70.jpg g138030i6807241189127b156e59.jpg g138030i695aa2f092b57609ec3a.jpg g138030ibe6e20a004318ec29a55.jpg g138030id6e956cc2faad2ba698c.jpg g138030ida830cb5bafcb81b3008.jpg g138030ie808a0dc95516821942e.jpg g138030if3599c7bde2ead0d96eb.jpg g138030if4a4638d71d20fd12da3.jpg http://fasb.org/us-gaap/2026 http://xbrl.sec.gov/dei/2026 http://xbrl.sec.gov/oef/2026 false false