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Financial Instruments - Financial Instruments and Balance Sheet Classification (Detail) - USD ($)
$ in Thousands
Jan. 31, 2018
Apr. 30, 2017
Jan. 31, 2017
Apr. 30, 2016
Investment Holdings [Line Items]        
Income Taxes & Other Receivables $ 25,985 $ 31,573    
Other Accrued Liabilities (163,784) (148,464)    
Cash and cash equivalents 389,990 410,882 $ 351,305 $ 273,252
Marketable Securities, Current 14,807 4,363    
Marketable securities, non-current 124,196 115,574    
Fair Value, Inputs, Level 1        
Investment Holdings [Line Items]        
Cost 514,192 524,700    
Unrealized Gains 15,489 6,697    
Unrealized Losses (688) (578)    
Fair Value 528,993 530,819    
Cash and cash equivalents 389,990 410,882    
Marketable Securities, Current 14,807 4,363    
Marketable securities, non-current 124,196 115,574    
Fair Value, Inputs, Level 1 | Cash        
Investment Holdings [Line Items]        
Cash and cash equivalents 388,962 409,824    
Cost 388,962 409,824    
Fair Value 388,962 409,824    
Fair Value, Inputs, Level 1 | Money Market Funds        
Investment Holdings [Line Items]        
Cash and cash equivalents 1,028 1,058    
Fair Value 1,028 1,058    
Cost 1,028 1,058    
Fair Value, Inputs, Level 1 | Mutual Funds        
Investment Holdings [Line Items]        
Unrealized Gains [1] 15,489 6,697    
Unrealized Losses [1] (688) (578)    
Marketable Securities, Current [1] 14,807 4,363    
Marketable securities, non-current [1] 124,196 115,574    
Cost [1] 124,202 113,818    
Fair Value [1] 139,003 119,937    
Fair Value, Inputs, Level 2 | Foreign Exchange Forward Contracts        
Investment Holdings [Line Items]        
Income Taxes & Other Receivables 78      
Other Accrued Liabilities (1,256) (717)    
Unrealized Gains 814 129    
Unrealized Losses (1,992) (846)    
Fair Value (1,178) (717)    
Fair Value, Inputs, Level 2 | Interest Rate Swap        
Investment Holdings [Line Items]        
Unrealized gains 1,390      
Unrealized Losses   (947)    
Fair Value 1,390 (947)    
Income Taxes & Other Receivables $ 1,390      
Other Accrued Liabilities   $ (947)    
[1] These investments are held in trust for settlement of the Company's vested obligations of $122.3 million and $99.5 million as of January 31, 2018 and April 30, 2017, respectively, under the ECAP (see Note 7 - Deferred Compensation and Retirement Plans). During the three and nine months ended January 31, 2018, the fair value of the investments increased; therefore, the Company recognized income of $7.2 million and $14.0 million, respectively, which was recorded in other income, net. During the three and nine months ended January 31, 2017, the fair value of the investments increased; therefore, the Company recognized income of $3.9 million and $7.1 million, respectively, which was recorded in other income, net.