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Accounting Policies (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended12 Months Ended
Jul. 31, 2011
Apr. 30, 2011
Apr. 30, 2010
Apr. 30, 2009
Accounting Policies (Textuals)    
Approximate percentage of net sales sold to Wal-Mart Stores, Inc. and subsidiaries 26.00%27.00%24.00%
Percentage of sales to be considered to determine major customers 10.00%  
Number of U.S. retail market segments that contain major customer sales 3  
Amount due from Wal-Mart Stores, Inc. and subsidiaries included in trade receivables $ 87,623$ 61,176 
Company's total promotional expenditures, including amounts classified as a reduction of net sales, represented approximately in percentage of net sales 26.00%  
Advertising Expense 115,066130,58377,363
Research and Development Costs 20,98120,96314,498
Requisite performance period for share based payments 1 year  
Requisite service period for share based payments 4 year  
Total unrecognized share-based compensation cost related to nonvested share-based awards46,54133,703  
Weighted-average period of recognition3.63  
Actual tax deductible benefit realized from share-based compensation 7,3103,0052,353
Excess tax benefits realized upon exercise or vesting of share-based compensation 6,9902,9082,372
Allowance for doubtful accounts 1,8821,521 
Work-in-process 77,59449,214 
Maximum maturity period of short-term investments to be considered as cash equivalents 3 months  
Rent expense 57,57255,01036,547
Fair value of available-for-sale marketable securities included in other current assets 18,600  
Proceeds from available-for-sale marketable securities realized upon maturity or sale18,60057,10013,5193,013
Fair value of available-for-sale marketable securities included in other noncurrent assets 41,56034,895 
Unrealized gains included in accumulated other comprehensive income (loss) on other investments 2,817693 
Approximate percentage of Company's employees covered by union contracts 32.00%  
Number of union contracts expiring in 2012 3  
Facilities covered by union contracts 10  
Increase (Decrease) in net provision for the allowance for doubtful accounts 361(480)1,091
Minimum operating lease obligations in 2012 26,110  
Minimum operating lease obligations in 2013 21,887  
Minimum operating lease obligations in 2014 18,956  
Minimum operating lease obligations in 2015 14,121  
Minimum operating lease obligations in 2016 and beyond $ 22,565  
Machinery and Equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Estimated minimum useful life of assets, in years 3  
Estimated maximum useful life of assets, in years 20  
Capitalized software costs [Member]
    
Property, Plant and Equipment [Line Items]    
Estimated minimum useful life of assets, in years 3  
Estimated maximum useful life of assets, in years 7  
Buildings, fixtures, and improvements [Member]
    
Property, Plant and Equipment [Line Items]    
Estimated minimum useful life of assets, in years 5  
Estimated maximum useful life of assets, in years 40