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DETAILS OF CERTAIN BALANCE SHEET ACCOUNTS Accounts receivable, net (Tables)
 3 Months Ended
Jun. 30, 2011
Balance Sheet Related Disclosures [Abstract]  
Accounts receivable, net [Table Text Block]
Accounts receivable, net:
 
 
June 30,
 
March 31,
(in thousands)
 
2011
 
2011
Accounts receivable
 
$
131,232


 
$
125,137


Provisions for returns
 
(8,800
)
 
(10,437
)
Provisions for promotions, rebates and other
 
(13,390
)
 
(10,460
)
Provision for doubtful accounts and sales allowances
 
(526
)
 
(951
)
Accounts receivable, net
 
$
108,516


 
$
103,289