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Schedule of Deferred Income Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
Jul. 31, 2013
Jul. 31, 2012
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]    
Inventory basis $ (314) $ (589)
Employee benefits 2,215 2,026
Self-insurance reserves 8,333 8,556
Accrued product warranties 30,802 26,690
Accrued incentives 2,672 2,369
Sales returns and allowances 1,381 1,145
Accrued expenses 2,145 1,399
Unrecognized tax benefits 984 963
Other (1,700) (1,662)
Total current net deferred tax asset 46,518 40,897
Property basis (2,007) (4,482)
Investments (121) (433)
Deferred compensation 3,349 5,069
Tax credit carryforwards 547  
Intangibles (33,464) (35,524)
Unrecognized tax benefits 13,136 14,436
Total net long-term deferred tax asset (liability) (18,560) (20,934)
Net deferred tax asset $ 27,958 $ 19,963