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Stock Plans (Details 2) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Compensation expense |  |  |
Recognized compensation expense | $ 112,200 | $ 34,400 | $ 32,600
Unrecognized compensation expense | $ 115,500 |  |
Vesting period | 3 years |  |
Excess tax benefit from share-based payment | $ 3,642 | 748 | 1,754
URS Corporation | Acquisition And Integration Expenses |  |  |
Compensation expense |  |  |
Compensation to settle accelerated equity awards | 43,900 |  |
Accelerated equity award - Company stock | 17,600 |  |
Accelerated equity award - cash | $ 26,300 |  |
Employee Stock Option |  |  |
Options Outstanding |  |  |
Number outstanding as of end of period (in shares) | 1,300,000 |  |
Weighted Average Remaining Contractual Life | 4 years 8 months 9 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 28.26 |  |
Aggregate Intrinsic Value (in millions) | $ 2,000 |  |
Options Exercisable |  |  |
Number Exercisable at the end of the period (in shares) | 700,000 |  |
Weighted Average Remaining Contractual Life | 1 year 1 month 6 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 25.04 |  |
Stock Incentive Plans, additional disclosures |  |  |
Remaining contractual life of options outstanding, low end of range | 15 days |  |
Remaining contractual life of options outstanding, high end of range | 8 years 5 months 5 days |  |
Aggregate intrinsic value of stock options exercised | $ 2,100 | $ 4,300 | 7,900
Compensation expense |  |  |
Weighted average grant-date fair value of stock options granted (in dollars per share) |  | $ 7.83 |
Number of stock options granted during the period | 0 |  |
Excess tax benefit from share-based payment | $ 3,600 | $ 700 | $ 1,800
Performance Earnings Program |  |  |
Compensation expense |  |  |
Weighted average grant-date fair value of stock options granted (in dollars per share) | $ 32.32 | $ 29.32 | $ 22.27
Performance period over which objectives must be met to qualify for an award grant | 3 years |  |
Restricted Stock Units (RSUs) |  |  |
Compensation expense |  |  |
Weighted average grant-date fair value of stock options granted (in dollars per share) | $ 31.05 | $ 29.60 | $ 22.83
Restricted Stock Units (RSUs) | URS Corporation |  |  |
Compensation expense |  |  |
Weighted average grant-date fair value of stock options granted (in dollars per share) | $ 30.04 |  |
Number of stock options granted during the period | 2,600,000 |  |
Exercise Price Range from Dollars 21.01 to Dollars 23.94 |  |  |
Information concerning outstanding and exercisable options |  |  |
Exercise price, low end of range (in dollars per share) | $ 21.01 |  |
Exercise price, high end of range (in dollars per share) | $ 23.94 |  |
Exercise Price Range from Dollars 21.01 to Dollars 23.94 | Employee Stock Option |  |  |
Options Outstanding |  |  |
Number outstanding as of end of period (in shares) | 200,000 |  |
Weighted Average Remaining Contractual Life | 2 months 23 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 23.19 |  |
Aggregate Intrinsic Value (in millions) | $ 1,100 |  |
Options Exercisable |  |  |
Number Exercisable at the end of the period (in shares) | 200,000 |  |
Weighted Average Remaining Contractual Life | 2 months 23 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 23.19 |  |
Exercise Price Range From Dollars 24.45 To Dollars 27.67 |  |  |
Information concerning outstanding and exercisable options |  |  |
Exercise price, low end of range (in dollars per share) | 24.45 |  |
Exercise price, high end of range (in dollars per share) | $ 27.67 |  |
Exercise Price Range From Dollars 24.45 To Dollars 27.67 | Employee Stock Option |  |  |
Options Outstanding |  |  |
Number outstanding as of end of period (in shares) | 400,000 |  |
Weighted Average Remaining Contractual Life | 1 year 5 months 19 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 25.43 |  |
Aggregate Intrinsic Value (in millions) | $ 900 |  |
Options Exercisable |  |  |
Number Exercisable at the end of the period (in shares) | 400,000 |  |
Weighted Average Remaining Contractual Life | 1 year 5 months 19 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 25.43 |  |
Exercise Price Range From Dollars 28.04 To Dollars 31.62 |  |  |
Information concerning outstanding and exercisable options |  |  |
Exercise price, low end of range (in dollars per share) | 28.04 |  |
Exercise price, high end of range (in dollars per share) | $ 31.62 |  |
Exercise Price Range From Dollars 28.04 To Dollars 31.62 | Employee Stock Option |  |  |
Options Outstanding |  |  |
Number outstanding as of end of period (in shares) | 700,000 |  |
Weighted Average Remaining Contractual Life | 7 years 8 months 1 day |  |
Weighted Average Exercise Price (in dollars per share) | $ 31.25 |  |
Options Exercisable |  |  |
Number Exercisable at the end of the period (in shares) | 100,000 |  |
Weighted Average Remaining Contractual Life | 2 years 4 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 28.53 |  |

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