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Reconciliation of Changes in Projected Benefit Obligation and Fair Value of Plan Assets and Funded Status for Gerstenslager Plan (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
May 31, 2012
May 31, 2011
May 31, 2010
Change in benefit obligation      
Benefit obligation, beginning of year $ 21,814 $ 19,451  
Service cost   575 490
Interest cost 1,213 1,140 1,059
Actuarial loss 10,496 1,061  
Benefits paid (500) (413)  
Benefit obligation, end of year 33,023 21,814 19,451
Change in plan assets      
Fair value, beginning of year 19,808 14,993  
Actual return on plan assets (789) 3,921 3,152
Company contributions 1,227 1,307  
Benefits paid (500) (413)  
Fair value, end of year 19,746 19,808 14,993
Funded status (13,277) (2,006)  
Amounts recognized in the consolidated balance sheets consist of:      
Other liabilities (13,277) (2,006)  
Accumulated other comprehensive income 16,897 4,067  
Amounts recognized in accumulated other comprehensive income consist of:      
Net loss 16,897 4,067  
Accumulated other comprehensive income $ 16,897 $ 4,067