Stock-Based Compensation - Activity (Details) - USD ($)
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3 Months Ended |
6 Months Ended |
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Jan. 31, 2016 |
Jan. 31, 2016 |
Jan. 31, 2016 |
Jan. 31, 2015 |
Jul. 31, 2015 |
| Stock-Based Compensation |
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| Total unrecognized stock-based compensation expense, before income taxes, related to total nonvested stock options and stock awards (in dollars) |
$ 20,138,000
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$ 20,138,000
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$ 20,138,000
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| Remaining weighted average period over which unrecognized stock-based compensation expense is expected to be recognized |
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23 months
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| Stock-based awards, additional disclosure |
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| Deduction in income tax due to exercise of options and vesting of restricted stock (in dollars) |
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$ 3,169,000
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$ 4,271,000
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| Increase in additional paid-in capital due to excess tax benefit on stock-based compensation expense (in dollars) |
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|
$ 1,541,000
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$ 2,463,000
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| 2006 Plan |
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| Stock-based awards, additional disclosure |
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| Shares available for grant |
0
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0
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0
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| 2016 Plan |
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| Stock-based awards, additional disclosure |
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| Maximum number of shares authorized for issuance |
1,200,000
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1,200,000
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1,200,000
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| Awards Granted (in shares) |
0
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| Percentage of awards that vest on each of the first three anniversaries of grant date subject to active employment |
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33.30%
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| Restricted shares |
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| Number of Shares |
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| Nonvested stock awards at the beginning of the period (in shares) |
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343,519
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| Granted (in shares) |
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162,265
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| Cancelled (in shares) |
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(1,823)
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| Vested (in shares) |
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(163,297)
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| Nonvested stock awards at the end of the period (in shares) |
340,664
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340,664
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340,664
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| Weighted Average Fair Value |
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| Nonvested stock awards at the beginning of the period (in dollars per share) |
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$ 32.77
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| Granted (in dollars per share) |
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54.25
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| Cancelled (in dollars per share) |
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37.57
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| Vested (in dollars per share) |
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27.99
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| Nonvested stock awards at the end of the period (in dollars per share) |
$ 45.27
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$ 45.27
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$ 45.27
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| Stock options |
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| Weighted-Average Black-Scholes Option Valuation Assumptions |
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| Dividend yield (as a percent) |
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0.22%
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0.25%
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| Expected volatility (as a percent) |
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55.90%
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33.90%
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| Risk-free interest rate (as a percent) |
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1.41%
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1.55%
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| Expected lives |
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5 years
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5 years
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| Stock options, additional disclosure |
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| Weighted average fair value of all options granted (in dollars per share) |
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$ 26.49
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$ 11.54
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| Aggregate intrinsic value of all options exercised (in dollars) |
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$ 0
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$ 0
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$ 2,420,000
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| Number of Shares |
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| Outstanding at the beginning of the period (in shares) |
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107,500
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| Granted (in shares) |
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15,000
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| Outstanding at the end of the period (in shares) |
122,500
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122,500
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122,500
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| Exercisable at the end of the period (in shares) |
80,834
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80,834
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80,834
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45,000
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| Weighted Average Exercise Price |
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| Outstanding at the beginning of the period (in dollars per share) |
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$ 25.73
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| Granted (in dollars per share) |
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55.36
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| Outstanding at the end of the period (in dollars per share) |
$ 29.36
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$ 29.36
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29.36
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| Exercisable at the end of the period (in dollars per share) |
$ 22.72
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$ 22.72
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$ 22.72
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$ 20.32
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