Earnings Per Share (EPS) (Details) (USD $) In Thousands, except Share data	3 Months Ended		6 Months Ended
	Jul. 03, 2011	Jul. 04, 2010	Jul. 03, 2011	Jul. 04, 2010
Basic EPS
Net income attributable to MTI	$ 16,413	$ 18,959	$ 32,194	$ 34,328
Weighted average shares outstanding	18,177,000	18,700,000	18,227,000	18,734,000
Basic earnings per share attributable to MTI	$ 0.90	$ 1.01	$ 1.77	$ 1.83
Diluted EPS
Net income attributable to MTI	$ 16,413	$ 18,959	$ 32,194	$ 34,328
Weighted average shares outstanding	18,177,000	18,700,000	18,227,000	18,734,000
Dilutive effect of stock options and stock units	100,000	0	200,000	100,000
Weighted average shares outstanding , adjusted	18,290,000	18,749,000	18,353,000	18,793,000
Diluted earnings per share attributable to MTI	$ 0.90	$ 1.01	$ 1.75	$ 1.83
Anti-dilutive options not included in the weighted average common shares outstanding calculation			123,363	621,814