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Reorganization Proceedings of Certain Subsidiaries - Additional Information (Detail) (USD $) | 12 Months Ended |  | 12 Months Ended |  |  |
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May 31, 2014 | May 31, 2010 | May 31, 2008 | Aug. 31, 2014 | Aug. 31, 2014 Second Anniversary | Aug. 31, 2014 Third Anniversary | Aug. 31, 2014 Fourth Anniversary | Aug. 31, 2014 NMBFil Inc | May 31, 2008 Subsidiaries | May 31, 2013 Subsidiaries | May 30, 2010 Subsidiaries | May 31, 2006 Subsidiaries
Reorganization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amount funded for trust as per agreement |  |  |  | $ 450,000,000 | $ 102,500,000 | $ 120,000,000 | $ 125,000,000 | $ 2,500,000 |  |  |  |
Percentage of interest accrue on aggregate funding amount |  |  |  | 3.45% |  |  |  |  |  |  |  |
Current and future asbestos claims |  |  |  |  |  |  |  |  |  | 1,170,000,000 |  |
Asbestos-related products liability claims paid |  | 92,600,000 |  |  |  |  |  |  |  |  |  |
Asbestos-related products liability, defense-related payments | 1,100,000 | 42,600,000 |  |  |  |  |  |  |  |  |  |
Accrued liability for asbestos |  |  |  |  |  |  |  |  | 559,700,000 |  | 397,700,000 | 421,300,000
Asbestos liability, term |  |  | 10 years |  |  |  |  |  |  |  |  |
Increase in Asbestos liability |  |  |  |  |  |  |  |  | $ 288,100,000 |  |  |

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- Definition The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Carrying amount as of the balance sheet date of reserves for the costs of settling insured claims and costs incurred in the claims settlement process attributable to asbestos and environmental claims, before estimated recoveries from reinsurers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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