3.22.1 html 12 79 1 true 9 0 false 2 false true R1.htm 00000003 - Document - Risk/Return Summary {Unlabeled} Sheet http://walt/role/RiskReturn Risk/Return Summary 1 false false R7.htm 040000 - Disclosure - Risk/Return Detail Data {Elements} Sheet http://xbrl.sec.gov/rr/role/RiskReturnDetailData Risk/Return Detail Data 2 false false All Reports Book All Reports fp0076328_485bpos-ixbrl.htm exd5letteragreesmall.htm exe2distagree.htm exi2legalcon.htm exjauditorcon.htm exq4poaheff.htm walt-20220601.xsd walt-20220601_cal.xml walt-20220601_def.xml walt-20220601_lab.xml walt-20220601_pre.xml walth485bpospe38x30x1.jpg walth485bpospe38x6x1.jpg BarChart1.png BarChart2.png http://xbrl.sec.gov/dei/2021q4 http://xbrl.sec.gov/rr/2021 true true