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CONSOLIDATED STATEMENTS OF CHANGES IN NET ASSETS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Operations:      
Net investment income $ 1,907 $ 2,544 $ 1,804
Net realized gain on investments 88,433 10,578 38,885
Net increase in unrealized appreciation of investments 16,367 78,635 12,999
Increase in net assets from operations 106,707 91,757 53,688
Distributions from:      
Undistributed net investment income (3,025) (3,003) (2,994)
Net realized gains (77,301) 0 0
Net realized gains deemed distributed to shareholders (3,215) (3,216) (45,748)
Capital share transactions:      
Allocated increase in share value for deemed distribution 3,215 3,216 45,748
Change in pension plan funded status 194 (430) (89)
Exercise of employee stock options 3,981 99 745
Stock option and restricted awards expense 515 1,050 957
Increase in net assets 31,071 89,473 52,307
Net assets, beginning of period 628,706 539,233 486,926
Net assets, end of period $ 659,777 $ 628,706 $ 539,233