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Significant Accounting Policies (Details Textual) |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended
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May 01, 2024 | Jan. 18, 2018 USD ($) | Apr. 01, 2017 | May 03, 2016 | Oct. 23, 2014 USD ($) | Mar. 28, 2012 | Mar. 31, 2018 USD ($) Clients shares | Mar. 31, 2017 USD ($) Clients | Dec. 31, 2017 USD ($) Clients shares
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Net cash provided by (used in) operating activities |  |  |  |  |  |  | $ (61,033,000) | $ (33,218,000) |
Payment for contingent consideration |  |  |  |  |  |  |  | $ 5,183,000 |
Clients exceeding consolidated accounts receivable percentage | Clients |  |  |  |  |  |  | 0 |  | 0
Consolidated accounts receivable percentage |  |  |  |  |  |  | 10.00% |  | 10.00%
Clients exceeding consolidated largest client revenue | Clients |  |  |  |  |  |  | 0 | 0 |
Consolidated largest client revenue (percent) |  |  |  |  |  |  | 10.00% | 10.00% |
Impairment of long-lived asset |  |  |  |  |  |  | $ 2,317,000 | $ 0 |
Cost method investments |  |  |  |  |  |  | 9,462,000 |  | $ 9,527,000
Goodwill |  |  |  |  |  |  | 832,510,000 |  | 835,935,000
Acquisition related costs |  |  |  |  |  |  | 376,000 | 234,000 |
Assets |  |  |  |  |  |  | 1,701,077,000 |  | 1,698,892,000
Liabilities |  |  |  |  |  |  | 1,836,394,000 |  | 1,791,519,000
Adjustment to deferred acquisition consideration included in interest expense |  |  |  |  |  |  | 11,000 | 29,000 |
Provisional tax expense |  |  |  |  |  |  |  |  | (26,674,000)
Doner |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Voting interest in variable interest entity (percent) |  |  | 65.00% |  |  | 30.00% |  |  |
Assets |  |  |  |  |  |  | 96,659,000 |  | 105,191,000
Liabilities |  |  |  |  |  |  | $ 50,997,000 |  | $ 59,783,000
Doner |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Ownership interest percentage increase on exercise of option |  |  | 15.00% |  |  |  |  |  |
Aggregate 2012 Acquisitions | Doner |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Ownership interest percentage increase on exercise of option |  |  |  |  |  | 70.00% |  |  |
Aggregate 2017 Step-up Transaction | Doner |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Ownership interest percentage increase on exercise of option |  |  | 85.00% |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  |  |  |  | 3 years |  |
Contract termination notice period |  |  |  |  |  |  | 30 days |  |
Contract payment term |  |  |  |  |  |  | 30 days |  |
Maximum |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  |  |  |  | 7 years |  |
Equity method investment, ownership percentage (percent) |  |  |  |  |  |  | 50.00% |  |
Contract termination notice period |  |  |  |  |  |  | 90 days |  |
Contract payment term |  |  |  |  |  |  | 60 days |  |
Wells Fargo Capital Finance, LLC |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  | May 03, 2021 | Sep. 30, 2019 |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 325,000,000 |  |  |  |
Contingent Payment |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Change in contingent purchase price obligation |  |  |  |  |  |  | $ 2,586,000 | 11,431,000 |
6.50% Notes due 2024 |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  | 6.50% |  |
Restricted Stock Units (RSUs) | Common Class A |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Stock issued during period (shares) | shares |  |  |  |  |  |  | 74,950 |  |
Restricted stock grant date fair value |  |  |  |  |  |  | $ 681,000 |  |
Forecast | 6.50% Notes due 2024 | Wells Fargo Capital Finance, LLC |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, maturity date | May 01, 2024 |  |  |  |  |  |  |  |
Stock Incentive Plan 2011 | Contingent Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Stock issued during period, restricted stock award (shares) | shares |  |  |  |  |  |  | 413,181 |  |
RSUs outstanding (shares) | shares |  |  |  |  |  |  | 930,600 |  |
Stock Incentive Plan 2016 | Contingent Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
RSUs outstanding (shares) | shares |  |  |  |  |  |  | 503,321 |  |
Aggregate grant date fair value |  | $ 4,514,000 |  |  |  |  |  |  |
Preferred Stock | Series 4 Convertible Preferred Stock |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Shares outstanding (shares) | shares |  |  |  |  |  |  | 95,000 |  | 95,000
Accounting Standards Update 2016-15 |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  | $ (2,542,000) |
Canada |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Effective tax rate (percent) |  |  |  |  |  |  | 24.10% |  |

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