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Changes in Accrued Warranty Balances (Detail) - USD ($)
$ in Thousands
12 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2013
Product Liability Contingency [Line Items]      
Beginning Balance $ 14,741 $ 9,330 $ 14,751
Deductions [1] (29,543) (19,155) (20,115)
Provision charged to SG&A expense 23,487 24,566 14,260
Acquisitions, including SPHC reconsolidation 2,978   434
Ending Balance $ 11,663 $ 14,741 $ 9,330
[1] Primarily claims paid during the year.