Operating Information by Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2011	Jan. 01, 2011
Net revenue:
Net revenue	$ 120,024	$ 148,863
Cost of sales :
Cost of sales	64,748	76,751
Gross profit :
Gross profit	55,276	72,112
Operating expenses:
Operating expenses	42,900	50,045
Income from operations:
Income from operations	12,376	22,067
Equipment Segment
Net revenue:
Net revenue	106,149	132,698
Cost of sales :
Cost of sales	59,004	70,238
Gross profit :
Gross profit	47,145	62,460
Operating expenses:
Operating expenses	37,268	43,276
Income from operations:
Income from operations	9,877	19,184
Expendable Tools Segment
Net revenue:
Net revenue	13,875	16,165
Cost of sales :
Cost of sales	5,744	6,513
Gross profit :
Gross profit	8,131	9,652
Operating expenses:
Operating expenses	5,632	6,769
Income from operations:
Income from operations	$ 2,499	$ 2,883