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Schedule of Deferred Income Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
Jul. 31, 2014
Jul. 31, 2013
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]    
Inventory basis $ (183) $ (314)
Employee benefits 2,543 2,215
Self-insurance reserves 10,139 8,333
Accrued product warranties 33,629 30,802
Accrued incentives 3,553 2,672
Sales returns and allowances 1,419 1,381
Accrued expenses 1,523 2,145
Unrecognized tax benefits 614 984
Other (1,840) (1,700)
Total net current deferred tax asset 51,397 46,518
Property basis (983) (2,007)
Investments   (121)
Deferred compensation 4,811 3,349
Tax credit carry forward 790 547
Intangibles (31,681) (33,464)
Unrecognized tax benefits 7,675 13,136
Total net long-term deferred tax asset (liability) (19,388) (18,560)
Net deferred tax asset $ 32,009 $ 27,958