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Long-Term Debt (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Oct. 31, 2011
Apr. 30, 2011
Line of credit facility, maximum borrowing capacity $ 50  
Line of Credit Facility, Expiration Date March 14, 2014  
Facility secured by equity interest in first tier foreign subsidiaries 65.00%  
Unrestricted cash and/or marketable securities 30  
Outstanding borrowings under facility 0 0
Collateral for standby letters of credit 10.0  
Standby letters of credit issued 2.9 2.9
Interest rate description Borrowings under the Facility bear interest, at the election of the Company, at the London Interbank Offered Rate ("LIBOR") plus applicable margin or the base rate plus applicable margin. The base rate is the highest of (i) the published prime rate, (ii) the federal funds rate plus 0.50%, or (iii) one month LIBOR plus 2.0%. The applicable margin is based on a percentage per annum determined in accordance with a specified pricing grid based on (a) the total funded debt ratio of the Company and (b) with respect to LIBOR loans, whether such LIBOR loans are cash collateralized. For cash collateralized LIBOR loans, the applicable margin will range from 0.65% to 3.15% per annum. For LIBOR loans that are not cash collateralized and for based rate loans, the applicable margin will range from 1.50% to 4.50% per annum (if using LIBOR) and from 1.50% to 4.75% per annum (if using base rate).  
Line of credit facility collateral The Facility is secured by substantially all of the assets of the Company's domestic subsidiaries and 65% of the equity interest in all the first tier foreign subsidiaries.  
Covenant description The financial covenants include a maximum consolidated leverage ratio, a minimum consolidated fixed charge coverage ratio and a minimum $30 million in unrestricted cash and/or marketable securities after taking into account the accrual for employee compensation and benefits.  
Letters Of Credit [Member]
    
Line of credit facility, maximum borrowing capacity $ 10  
Maximum [Member]
    
Quarterly commitment fees 0.50%  
Maximum [Member] | Cash Collateralized LIBOR Loan [Member]
    
Margin for cash collateral 3.15%  
Maximum [Member] | Libor [Member] | Uncollateralized LIBOR Loan [Member]
    
Margin for non cash collateral 4.50%  
Maximum [Member] | Base Rate [Member] | Uncollateralized Base Rate [Member]
    
Margin for non cash collateral 4.75%  
Minimum [Member]
    
Quarterly commitment fees 0.25%  
Minimum [Member] | Cash Collateralized LIBOR Loan [Member]
    
Margin for cash collateral 0.65%  
Minimum [Member] | Libor [Member] | Uncollateralized LIBOR Loan [Member]
    
Margin for non cash collateral 1.50%  
Minimum [Member] | Base Rate [Member] | Uncollateralized Base Rate [Member]
    
Margin for non cash collateral 1.50%