Quarterly report pursuant to Section 13 or 15(d)

Defined Benefit Pension and Other Postretirement Benefit Plans (Details)

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Defined Benefit Pension and Other Postretirement Benefit Plans (Details) (USD $)
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Sep. 30, 2012
Defined benefit pension plans
Sep. 30, 2011
Defined benefit pension plans
Sep. 30, 2012
Defined benefit pension plans
Sep. 30, 2011
Defined benefit pension plans
Jul. 31, 2012
Defined benefit pension plans
Minimum
Sep. 30, 2012
Defined benefit pension plans
Europe
plan
Sep. 30, 2012
Defined benefit pension plans
Singapore
plan
Sep. 30, 2012
Defined benefit pension plans
Mexico
plan
Sep. 30, 2012
Defined benefit postretirement pension plan
Sep. 30, 2011
Defined benefit postretirement pension plan
Sep. 30, 2012
Defined benefit postretirement pension plan
Sep. 30, 2011
Defined benefit postretirement pension plan
Net periodic benefit costs                            
Net service cost     $ 415,000 $ 331,000 $ 829,000 $ 663,000                
Interest cost     494,000 533,000 988,000 1,067,000         7,000 8,000 14,000 22,000
Expected return on net assets     (172,000) (175,000) (344,000) (350,000)                
Amortization:                            
Actuarial (gain) loss     130,000 96,000 260,000 191,000         (81,000) (91,000) (161,000) (162,000)
Prior service cost     6,000 6,000 12,000 12,000                
Settlement gain on benefit plan (1,675,000) (1,675,000) (1,675,000)   (1,675,000)                  
Total net periodic benefit (income) costs     (802,000) 791,000 70,000 1,583,000         (74,000) (83,000) (147,000) (140,000)
Estimated employer contribution in current fiscal year     2,400,000   2,400,000                  
Contribution by employer         $ 1,500,000                  
Number of defined benefit pension plans               7 1 2        
Percentage of pension liability paid upon retirement             20.00%