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Acquisitions and Dispositions - Summary of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | 6 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Mar. 31, 2019 | Jun. 28, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Final Valuation |  |  |  |  |  |
Goodwill | $ 738,369 |  |  | $ 404,713 |  | $ 394,919
Clean Earth |  |  |  |  |  |
Final Valuation |  |  |  |  |  |
Intangible assets | 242,200 |  | $ 261,100 |  |  |
Altek |  |  |  |  |  |
Final Valuation |  |  |  |  |  |
Cash and cash equivalents |  | $ 1,700 |  |  | $ 1,700 |
Net working capital |  | (1,300) |  |  | (1,500) |
Property, plant and equipment |  | 3,300 |  |  | 3,300 |
Intangible assets |  | 52,700 |  |  | 52,500 |
Goodwill |  | 22,500 |  |  | 20,900 |
Net deferred tax liabilities |  | (8,500) |  |  | (8,500) |
Other liabilities |  | (300) |  |  | (300) |
Total identifiable net assets of Altek |  | 70,100 |  |  | $ 68,100 |
Measurement Period Adjustments |  |  |  |  |  |
Net working capital |  | 200 |  |  |  |
Intangible assets |  | 200 |  |  |  |
Goodwill |  | 1,600 |  |  |  |
Total identifiable net assets of Altek |  | $ 2,000 |  |  |  |
Clean Earth |  |  |  |  |  |
Final Valuation |  |  |  |  |  |
Goodwill | 330,230 |  |  | $ 0 |  | $ 0
Measurement Period Adjustments |  |  |  |  |  |
Intangible assets | (18,900) |  |  |  |  |
Clean Earth | Clean Earth |  |  |  |  |  |
Final Valuation |  |  |  |  |  |
Cash and cash equivalents | 3,600 |  | 42,800 |  |  |
Property, plant and equipment | 77,300 |  | 75,600 |  |  |
Intangible assets | 242,200 |  | 261,100 |  |  |
Goodwill | 330,200 |  | 313,800 |  |  |
Net deferred tax liabilities | (45,800) |  | (51,200) |  |  |
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Assets, Trade Receivables | 62,500 |  | 63,700 |  |  |
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Assets, Other Receivables | 2,100 |  | 800 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other | 7,300 |  | 8,700 |  |  |
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Operating Lease, Right-of-Use Asset | 25,800 |  | 14,400 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets | 1,000 |  | 4,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable | (23,100) |  | (23,000) |  |  |
Business Combination, Provisional Information Initial Accounting Incomplete, Adjustment, Accounts Payable | (100) |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Liabilities, Acquisition Consideration Payable | 0 |  | (39,200) |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other | (19,300) |  | (18,000) |  |  |
Business Combination, Recognized Identifiable Asset Acquired and Liability Assumed, Lease Obligation | (19,500) |  | (11,100) |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other | (8,600) |  | (6,500) |  |  |
Total identifiable net assets of Altek | 635,700 |  | $ 635,900 |  |  |
Measurement Period Adjustments |  |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Cash | (39,200) |  |  |  |  |
Business Combination Provisional Information Initial Accounting Incomplete Adjustment | (1,200) |  |  |  |  |
Business Combination Provisional Information Initial Accounting Incomplete Adjustment, Other Receivables | 1,300 |  |  |  |  |
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Other Current Assets | (1,400) |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment | 1,700 |  |  |  |  |
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Right of Use Asset | 11,400 |  |  |  |  |
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Other Assets | (3,000) |  |  |  |  |
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Acquisition Consideration Payable | 39,200 |  |  |  |  |
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Other Current Liabilities | (1,300) |  |  |  |  |
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Net deferred Taxes Liability | 5,400 |  |  |  |  |
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Operating lease liabilities | (8,400) |  |  |  |  |
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Other Liabilities | (2,100) |  |  |  |  |
Intangible assets | (18,900) |  |  |  |  |
Goodwill | 16,400 |  |  |  |  |
Total identifiable net assets of Altek | $ (200) |  |  |  |  |

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