Goodwill and Related Intangible Assets (Schedule of Goodwill Impairment Tests) (Details)	Dec. 31, 2016	Oct. 31, 2015	Oct. 31, 2014
Minimum
Goodwill [Line Items]
WACC		12.40%	11.30%
Maximum
Goodwill [Line Items]
WACC		13.00%	13.10%
Renewable Energy & Conservation | Greenhouse
Goodwill [Line Items]
WACC	15.10%
Renewable Energy & Conservation | Solar
Goodwill [Line Items]
WACC	16.10%