Significant Accounting Policies (Segment Reporting Revenue Percentage) (Detail)	3 Months Ended		9 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Core Segment
Segment Reporting Information [Line Items]
Revenue, by segment	63.00%	65.00%	65.00%	65.00%
Performance Segment
Segment Reporting Information [Line Items]
Revenue, by segment	30.00%	30.00%	29.00%	30.00%
New Business Segment
Segment Reporting Information [Line Items]
Revenue, by segment	4.00%	4.00%	3.00%	4.00%
Specialty Fluids Segment
Segment Reporting Information [Line Items]
Revenue, by segment	3.00%	1.00%	3.00%	1.00%