Restructuring Costs (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jun. 30, 2012
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	$ 1,015
Total Incurred as of June 30, 2012	687
Estimated future expense	328
One-time Termination Benefits
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	802
Total Incurred as of June 30, 2012	539
Estimated future expense	263
Equipment Moving Costs and Method Transfers
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	82
Total Incurred as of June 30, 2012	82
Employee Relocation
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	68
Total Incurred as of June 30, 2012	41
Estimated future expense	27
Other Restructuring
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	36
Total Incurred as of June 30, 2012	6
Estimated future expense	30
Gains (Losses) on Sales of Assets
Restructuring Cost and Reserve [Line Items]
Total Costs Expected to be Incurred	27
Total Incurred as of June 30, 2012	19
Estimated future expense	$ 8