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Share-Based Payments - Exercisable Options (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Compensation expense |  |  |
Recognized compensation expense | $ 73,400 | $ 112,200 | $ 34,400
Unrecognized compensation expense | $ 91,800 | 115,500 |
Vesting period | 3 years |  |
Excess tax benefit from share-based payment |  | 3,642 | 748
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) | 900,000 |  |
Weighted Average Remaining Contractual Life | 5 years 7 months 24 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 30.36 |  |
Aggregate Intrinsic Value (in millions) | $ 600 |  |
Options Exercisable |  |  |
Number Exercisable at the end of the period (in shares) | 300,000 |  |
Weighted Average Remaining Contractual Life | 10 months 10 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 26.99 |  |
Stock Incentive Plans, additional disclosures |  |  |
Remaining contractual life of options outstanding, low end of range | 9 months 4 days |  |
Remaining contractual life of options outstanding, high end of range | 6 years 8 months 19 days |  |
Aggregate intrinsic value of stock options exercised | $ 600 | $ 2,100 | 4,300
Compensation expense |  |  |
Number of stock options granted during the period | 0 | 0 |
Excess tax benefit from share-based payment | $ 0 | $ 3,600 | $ 700
Performance Earnings Program |  |  |
Compensation expense |  |  |
Weighted average grant-date fair value of stock options granted (in dollars per share) | $ 29.91 | $ 32.32 | $ 29.32
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) | $ 29.82 | 31.05 | $ 29.60
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 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) | 200,000 |  |
Weighted Average Remaining Contractual Life | 9 months 4 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 26.21 |  |
Aggregate Intrinsic Value (in millions) | $ 500 |  |
Options Exercisable |  |  |
Number Exercisable at the end of the period (in shares) | 200,000 |  |
Weighted Average Remaining Contractual Life | 9 months 4 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 26.21 |  |
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 | 6 years 8 months 19 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 31.27 |  |
Aggregate Intrinsic Value (in millions) | $ 100 |  |
Options Exercisable |  |  |
Number Exercisable at the end of the period (in shares) | 100,000 |  |
Weighted Average Remaining Contractual Life | 1 year 18 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 28.52 |  |

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