Employee Benefit Plans (Details) (USD $)	12 Months Ended
	Mar. 31, 2012 Age Participants	Mar. 31, 2011	Mar. 31, 2010	Apr. 02, 2011
Employee Benefit Plan (Textual) [Abstract]
Total contribution to the employee benefit plans	$ 9,800,000	$ 8,900,000	$ 9,300,000
The maximum company contribution to per employee	4,500
Participants age limit eligible to make catch up salary deferral contribution	50
Maximum percentage of employee compensation that the employee contributed to their 401 (k) accounts	50.00%
First part of employee compensation that the employee contributed to their 401 (k) accounts	8.00%
Percentage of salary deferrals of the eligible annual salary	25.00%
Number of participants in the plan who self direct their contribution in to investment option	130
Employee benefit plan assets	38,900,000			37,600,000
Employee benefit plan obligations	$ 45,100,000			$ 43,200,000