|
Inventories (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified |
Apr. 30, 2012
|
Jul. 31, 2011
|
|---|---|---|
| Inventories [Abstract] | ||
| Inventory | $ 233,067 | $ 213,662 |
| Subsidiaries valued inventory in first-in, first-out method | $ 36,408 | $ 25,530 |