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Code of Conduct, Related Person Transaction Policy and Associate Matters (Details) - USD ($) $ in Millions | 3 Months Ended
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Oct. 31, 2015 | May. 03, 2014
Related Party Transaction [Line Items] |  |
Related Party Transaction, Purchases from Related Party |  | $ 21.0
Land under Purchase Options, Recorded |  | $ 7.0
2015 NACO Beauty Park Purchase [Member] |  |
Related Party Transaction [Line Items] |  |
Related Party Transaction, Purchases from Related Party | $ 5.3 |
2015 NACO Historic Land Purchase [Member] |  |
Related Party Transaction [Line Items] |  |
Related Party Transaction, Purchases from Related Party | $ 0.0 |

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- Definition The carrying amount as of the balance sheet date of land not owned but under a contract in which the entity has an option to purchase the land. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |