Percentage of Consolidated Revenues Attributed To Customers (Detail)	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Fine Chemicals Customer One
Revenue, Major Customer [Line Items]
Entity-Wide Revenue, Major Customer, Percentage	32.00%	33.00%	34.00%	32.00%
Fine Chemicals Customer Two
Revenue, Major Customer [Line Items]
Entity-Wide Revenue, Major Customer, Percentage	15.00%		11.00%
Specialty Chemicals Customer
Revenue, Major Customer [Line Items]
Entity-Wide Revenue, Major Customer, Percentage		27.00%		16.00%
Specialty Chemicals Customer Two
Revenue, Major Customer [Line Items]
Entity-Wide Revenue, Major Customer, Percentage		11.00%	16.00%	18.00%