|**Acquisitions (Tables)**                 | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                   
|----------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|
|**Acquisitions [Abstract]**               |                                                                                                                                                                                                                                                                                                                                                                                                                   
|Schedule Of Purchase Price Allocation     | May 1, 2012Property, plant and equipment, net
				$
				119,595Current assets
				
				6,852Other long-term assets
				
				7,525Goodwill
				
				1,679Total assets acquired
				
				135,651Current liabilities
				
				3,409Long-term debt, excluding current portion
				
				14,233Other long-term liabilities
				
				15,855Total liabilities assumed
				
				33,497Net assets acquired
				$
				102,154
|                                          |                                                                                                                                                                                                                                                                                                                                                                                                                   
|                                          |                                                                                                                                                                                                                                                                                                                                                                                                                   
|                                          | May 1, 2012                                                                                                                                                                                                                                                                                                                                                                                                       
|Property, plant and equipment, net        | $                                                                                                                                                                                                                                                                                                                                                                                                                 
|Current assets                            |                                                                                                                                                                                                                                                                                                                                                                                                                   
|Other long-term assets                    |                                                                                                                                                                                                                                                                                                                                                                                                                   
|Goodwill                                  |                                                                                                                                                                                                                                                                                                                                                                                                                   
|Total assets acquired                     |                                                                                                                                                                                                                                                                                                                                                                                                                   
|                                          |                                                                                                                                                                                                                                                                                                                                                                                                                   
|Current liabilities                       |                                                                                                                                                                                                                                                                                                                                                                                                                   
|Long-term debt, excluding current portion |                                                                                                                                                                                                                                                                                                                                                                                                                   
|Other long-term liabilities               |                                                                                                                                                                                                                                                                                                                                                                                                                   
|Total liabilities assumed                 |                                                                                                                                                                                                                                                                                                                                                                                                                   
|                                          |                                                                                                                                                                                                                                                                                                                                                                                                                   
|Net assets acquired                       | $                                                                                                                                                                                                                                                                                                                                                                                                                 

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