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Financial Instruments - Financial Instruments and Balance Sheet Classification (Detail) - USD ($)
$ in Thousands
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2015
Investment Holdings [Line Items]        
Income Taxes & Other Receivables $ 29,089 $ 31,573    
Other Accrued Liabilities (170,339) (148,464)    
Cash and cash equivalents 520,848 410,882 $ 273,252 $ 380,838
Marketable Securities, Current 14,293 4,363    
Marketable securities, non-current 122,792 115,574    
Fair Value, Inputs, Level 1        
Investment Holdings [Line Items]        
Cost 647,925 524,700    
Unrealized Gains 11,040 6,697    
Unrealized Losses (1,032) (578)    
Fair Value 657,933 530,819    
Cash and cash equivalents 520,848 410,882    
Marketable Securities, Current 14,293 4,363    
Marketable securities, non-current 122,792 115,574    
Fair Value, Inputs, Level 1 | Cash        
Investment Holdings [Line Items]        
Cash and cash equivalents 519,818 409,824    
Cost 519,818 409,824    
Fair Value 519,818 409,824    
Fair Value, Inputs, Level 1 | Money Market Funds        
Investment Holdings [Line Items]        
Cash and cash equivalents 1,030 1,058    
Fair Value 1,030 1,058    
Cost 1,030 1,058    
Fair Value, Inputs, Level 1 | Mutual Funds        
Investment Holdings [Line Items]        
Unrealized Gains [1] 11,040 6,697    
Unrealized Losses [1] (1,032) (578)    
Marketable Securities, Current [1] 14,293 4,363    
Marketable securities, non-current [1] 122,792 115,574    
Cost [1] 127,077 113,818    
Fair Value [1] 137,085 119,937    
Fair Value, Inputs, Level 2 | Foreign Exchange Forward Contracts        
Investment Holdings [Line Items]        
Income Taxes & Other Receivables 753      
Other Accrued Liabilities   (717)    
Unrealized Gains 1,778 129    
Unrealized Losses (1,025) (846)    
Fair Value 753 (717)    
Fair Value, Inputs, Level 2 | Interest Rate Swap        
Investment Holdings [Line Items]        
Unrealized gains 2,076      
Unrealized Losses   (947)    
Fair Value 2,076 (947)    
Income Taxes & Other Receivables $ 2,076      
Other Accrued Liabilities   $ (947)    
[1] These investments are held in trust for settlement of the Company's vested obligations of $118.2 million and $99.5 million as of April 30, 2018 and 2017, respectively, under the ECAP (see Note 6 - Deferred Compensation and Retirement Plans). During fiscal 2018 and 2017, the fair value of the investments increased; therefore, the Company recognized income of $10.3 million and $10.8 million, respectively which was recorded in other income (loss), net. During fiscal 2016, the fair value of the investments decreased; therefore, the Company recognized a loss of $3.3 million, which was recorded in other income (loss), net.