$AYI is one of biggest losers #stocks today. read more:

Acuity Brands Inc (Holding Comp (symbol: AYI) was one of the worst losers
of the trading day today (2016-10-05), losing -4.71%. The number of shares
that changed hands was 2,595,390, or about 10 times the average daily
volume in the stock.
The closing price was $242.99, amounting to a market cap of
$10,570,000,000, about -13.49% off the highest price in the last 12 months.
The stock has been trading at a range between $169.42 and $280.89.
AYI is in the Building Products industry, part of the Consumer Durables
sector.
Looking at its valuation, the stock is now trading at 39.7 times earnings.