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Changes in Accrued Warranty Balances (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Aug. 31, 2015 | Aug. 31, 2014
Product Liability Contingency [Line Items] |  |  |
Beginning Balance |  | $ 11,663 | $ 14,741
Deductions | [1] | (4,660) | (14,675)
Provision charged to SG&A expense |  | 3,109 | 7,355
Ending Balance |  | $ 10,112 | $ 7,421
[1] | Primarily claims paid during the year.

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- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(5)) -URI http://asc.fasb.org/extlink&oid=51674963&loc=d3e12565-110249 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Represents the aggregate decrease in the liability related to payments to satisfy claims for standard and extended product warranties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(2)) -URI http://asc.fasb.org/extlink&oid=51674963&loc=d3e12565-110249 + Details
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- Definition Represents the aggregate increase in the liability for accruals related to standard and extended product warranties issued during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(3)) -URI http://asc.fasb.org/extlink&oid=51674963&loc=d3e12565-110249 + Details
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