Net Assets Investment Company, Portfolio Turnover C000027439 [Member] Boston Trust Asset Management Fund C000027440 [Member] Boston Trust Equity Fund C000052650 [Member] Boston Trust Midcap Fund C000106778 [Member] Boston Trust SMID Cap Fund C000027441 [Member] Boston Trust Walden Balanced Fund C000027444 [Member] Boston Trust Walden Equity Fund C000102803 [Member] Boston Trust Walden Midcap Fund C000106779 [Member] Boston Trust Walden SMID Cap Fund C000027445 [Member] Boston Trust Walden Small Cap Fund C000129551 [Member] Boston Trust Walden International Equity Fund Investment Type [Axis] Financial Services Sector [Member] Healthcare Sector [Member] Energy Sector [Member] Real Estate Sector [Member] Investment Companies [Member] ASML Holding NV [Member] Royal Bank of Canada [Member] Roche Holding AG [Member] Schneider Electric SE [Member] Sumitomo Mitsui Financial Group, Inc. [Member] DBS Group Holdings Ltd. [Member] Air Liquide SA [Member] Next PLC [Member] Atlas Copco AB, Class B [Member] Assa Abloy AB, Class B [Member] Watts Water Technologies, Inc., Class A [Member] Applied Industrial Technologies, Inc. [Member] A10 Networks, Inc. [Member] Axcelis Technologies, Inc. [Member] Littelfuse, Inc. [Member] Plexus Corp. [Member] UFP Technologies, Inc. [Member] Cavco Industries, Inc. [Member] Globus Medical, Inc., Class A [Member] Valmont Industries, Inc. [Member] IDEX Corp. [Member] Hubbell, Inc. [Member] Cincinnati Financial Corp. [Member] NetApp, Inc. [Member] Cullen/Frost Bankers, Inc. [Member] Acuity, Inc. [Member] Nordson Corp. [Member] F5, Inc. [Member] Qualys, Inc. [Member] Fortinet, Inc. [Member] Mettler-Toledo International, Inc. [Member] Teradyne, Inc. [Member] Eversource Energy [Member] Paychex, Inc. [Member] SEI Investments Co. [Member] TE Connectivity PLC [Member] Keysight Technologies, Inc. [Member] Essential Utilities, Inc. [Member] Apple, Inc. [Member] Alphabet, Inc., Class C [Member] Microsoft Corp. [Member] Applied Materials, Inc. [Member] JPMorgan Chase And Co [Member] JPMorgan Chase & Co [Member] NVIDIA Corp. [Member] Visa, Inc., Class A [Member] KLA Corp. [Member] Alphabet, Inc., Class A [Member] Cisco Systems, Inc. [Member] U.S. Government And U.S. Government Agency Obligations [Member] U.S. Government & U.S. Government Agency Obligations [Member] Municipal Bond [Member] U.S. Treasury Note [Member] U.S. Treasury Bond [Member] U.S. Treasury Inflation Indexed Note [Member] Snap-on, Inc. [Member] Medpace Holdings, Inc. [Member] Edwards Lifesciences Corp. [Member] W.W. Grainger, Inc. [Member] Johnson And Johnson [Member] Johnson & Johnson [Member] Exxon Mobil Corp. [Member] Costco Wholesale Corp. [Member]