| **Long-Term Debt (Schedule Of Debt Instruments) (Details) - USD ($) $ in Thousands** | 9 Months Ended  |           |           |
|--------------------------------------------------------------------------------------|-----------------|-----------|-----------|
||
| Total debt                                                                           | $ 629,178       | $ 816,830 | $ 636,749 |
| Less: Current maturities                                                             | 13,349          | 10,154    | 256,953   |
| Long-term debt                                                                       | $ 615,829       | 806,676   | 379,796   |
| Stated percentage in the debt instrument                                             | 6.50%           |      |      |
| Credit Facility Revolver [Member]                                                    |            |      |      |
| Total debt                                                                           | $ 0             | 185,000   | 0         |
| Fiscal year maturity                                                                 | 2020            |      |      |
| Term Loan [Member]                                                                   |            |      |      |
| Total debt                                                                           | $ 243,750       | 250,000   | 0         |
| Fiscal year maturity                                                                 | 2020            |      |      |
| Industrial Development Bonds [Member]                                                |            |      |      |
| Total debt                                                                           | $ 0             | 0         | 41,200    |
| Fiscal year maturity                                                                 | 2020            |      |      |
| Employee Housing Bonds [Member]                                                      |            |      |      |
| Total debt                                                                           | $ 52,575        | 52,575    | 52,575    |
| 6.50% Notes [Member]                                                                 |            |      |      |
| Total debt                                                                           | $ 0             | 0         | 215,000   |
| Fiscal year maturity                                                                 | 2019            |      |      |
| Stated percentage in the debt instrument                                             | 6.50%           |      |      |
| Long term debt interest rate                                                         | 6.50%           |      |      |
| Canyons Obligation [Member]                                                          |            |      |      |
| Total debt                                                                           | $ 321,688       | 317,455   | 316,056   |
| Fiscal year maturity                                                                 | 2063            |      |      |
| Other [Member]                                                                       |            |      |      |
| Total debt                                                                           | $ 11,165        | $ 11,800  | $ 11,918  |
| Maximum [Member] | Employee Housing Bonds [Member]                                   |            |      |      |
| Fiscal year maturity, end                                                            | May  01,  2039  |      |      |
| Maximum [Member] | Other [Member]                                                    |            |      |      |
| Fiscal year maturity, end                                                            | Jul. 31,  2029  |      |      |
| Minimum [Member] | Employee Housing Bonds [Member]                                   |            |      |      |
| Fiscal year maturity, start                                                          | Jun.  01,  2027 |      |      |
| Minimum [Member] | Other [Member]                                                    |            |      |      |
| Fiscal year maturity, start                                                          | Jul. 31,  2016  |      |      |

| X                                                                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Debt Instrument, Year of Maturity
+ References
No definition available.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The average effective interest rate during the reporting period.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Contractual interest rate for funds borrowed, under the debt agreement.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Earliest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.
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