Capital Expenditures and Depreciation Expense by Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2011	Jan. 01, 2011
Segment Reporting Information [Line Items]
Capital expenditures	$ 1,498	$ 2,705
Depreciation expense	1,963	2,021
Equipment Segment
Segment Reporting Information [Line Items]
Capital expenditures	1,187	1,487
Depreciation expense	1,400	1,522
Expendable Tools Segment
Segment Reporting Information [Line Items]
Capital expenditures	311	1,218
Depreciation expense	$ 563	$ 499