Earnings Per Share (EPS) (Details) (USD $) In Thousands, except Share data	3 Months Ended		9 Months Ended
	Oct. 02, 2011	Oct. 03, 2010	Oct. 02, 2011	Oct. 03, 2010
Basic EPS
Net income attributable to MTI	$ 15,688	$ 16,702	$ 47,882	$ 51,030
Weighted average shares outstanding	17,928,000	18,536,000	18,128,000	18,669,000
Basic earnings per share attributable to MTI	$ 0.88	$ 0.90	$ 2.64	$ 2.73
Diluted EPS
Net income attributable to MTI	$ 15,688	$ 16,702	$ 47,882	$ 51,030
Weighted average shares outstanding	17,928,000	18,536,000	18,128,000	18,669,000
Dilutive effect of stock options and stock units	100,000	100,000	100,000	0
Weighted average shares outstanding , adjusted	18,019,000	18,600,000	18,242,000	18,729,000
Diluted earnings per share attributable to MTI	$ 0.87	$ 0.90	$ 2.62	$ 2.72
Anti-dilutive options not included in the weighted average common shares outstanding calculation			603,869	386,775