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Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Apr. 30, 2018
Apr. 30, 2017
Income Taxes [Line Items]    
Deferred compensation $ 67,852 $ 92,043
Loss and credit carryforwards 22,297 32,854
Reserves and accruals 13,945 14,095
Deferred rent 6,827 9,797
Deferred revenue 1,793 2,434
Allowance for doubtful accounts 2,296 1,705
Other 982 3,041
Gross deferred tax assets 115,992 155,969
Intangibles (57,046) (90,214)
Property and equipment (5,000) (11,507)
Prepaid expenses (19,123) (17,324)
Other (2,726) (2,485)
Gross deferred tax liabilities (83,895) (121,530)
Valuation allowances (15,682) (21,278)
Net deferred tax asset $ 16,415 $ 13,161