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Schedule of Change in Retained Earnings (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Oct. 31, 2014 | Oct. 31, 2013
Retained Earnings Adjustments [Line Items] |  |
Beginning Balance | $ 1,030,428 |
Net income | 38,925 | 41,108
Dividends declared and paid | (14,412) |
Ending Balance | $ 1,054,941 |

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