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