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Debt - Additional Information (Detail) |  |  | 9 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 11, 2019 USD ($) | Aug. 04, 2017 USD ($) | Dec. 31, 2019 USD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Dec. 29, 2019 | Dec. 28, 2019 | Sep. 30, 2019 | Dec. 07, 2018 USD ($) | Dec. 07, 2018 CAD ($) | Apr. 23, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Increase in borrowing capacity |  | $ 325,000,000 |  |  |  |  |  |  |  |  |  |
Company owned capital stock percentage |  | 65.00% |  |  |  |  |  |  |  |  |  |
Weighted-average interest rate |  |  |  | 3.50% | 3.70% |  |  |  |  |  |  |
Short term borrowing outstanding amount |  |  |  | $ 34,153,000 | $ 46,544,000 |  |  |  |  |  |  |
Short-term debt, weighted-average interest rates |  |  |  | 2.00% | 3.00% |  |  |  |  |  |  |
Payments of debt issuance costs |  |  |  |  | $ 1,393,000 |  |  |  |  |  |  |
Write off of deferred debt issuance costs |  |  |  |  | 483,000 |  |  |  |  |  |  |
Amortization expense included in interest expense |  |  |  | $ 2,072,000 | 1,673,000 | $ 1,316,000 |  |  |  |  |  |
Deferred financing fees, net of accumulated amortization |  |  |  | 6,421,000 | 8,493,000 |  |  |  |  |  |  |
2027 Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate of debt instrument | 4.375% |  |  |  |  |  |  |  |  |  |  |
Long-term debt | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from debt, net | $ 296,250,000 |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  | 4,607,000 |  |  |  |  |  |  |  |
2023 Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate of debt instrument |  |  |  |  |  |  |  |  |  |  |  | 5.00%
Long-term debt |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000
2038 Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest paid |  |  |  | 36,365,000 | 38,632,000 | $ 29,552,000 |  |  |  |  |  |
Convertible Notes Payable |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Available lines of credit |  |  |  | 697,875,000 | 693,640,000 |  |  |  |  |  |  |
Stand by letters of credit |  |  |  | 2,959,000 | 7,720,000 |  |  |  |  |  |  |
Uncommitted remaining borrowing capacity |  |  |  | 122,303,000 | $ 105,946,000 |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total purchase consideration |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  |
2017 Revolver borrowings | Secured Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  | $ 299,105,000 |  |
Face value of debt instrument |  | $ 150,000,000 |  |  |  |  |  |  |  |  |  |
Available lines of credit |  |  |  | 376,039,000 |  |  |  |  |  |  |  |
2017 Revolver borrowings | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | 600,000,000 |  |  |  |  |  |  |  | 100,000,000 |  |
Available lines of credit |  |  |  | 0 |  |  |  |  |  |  |  |
Long term debt and capital lease obligation, current |  |  |  | $ 45,579,000 |  |  |  |  |  |  |  |
Amended 2017 Term Loan | Secured Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  | 449,105,000 |  |
Amended 2017 Term Loan | Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  | 99,105,000 | $ 133,050,000 |
Amended 2017 Revolver | Secured Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  | $ 700,000,000 |  |
Debt Instrument Quarterly Installments Beginning December 31, 2018 Through December 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Periodic payment |  | 5,645,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument Quarterly Installments Beginning December 31, 2019 Through December 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Periodic payment |  | 8,468,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument Quarterly Installments Beginning December 31, 2020 Through September 29, 2022 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Periodic payment |  | 11,290,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument Final Installments Payable On September 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Periodic payment |  | $ 320,000,000 |  |  |  |  |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) | 2017 Revolver And 2017 Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest at a floating rate |  | 1.25% |  |  |  |  |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) | 2017 Revolver And 2017 Term Loan | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest at a floating rate |  | 1.25% |  |  |  |  |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) | 2017 Revolver And 2017 Term Loan | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest at a floating rate |  | 2.00% |  |  |  |  |  |  |  |  |  |
Fed Funds Effective Rate Overnight Index Swap Rate | 2017 Revolver And 2017 Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest at a floating rate |  | 0.50% |  |  |  |  |  |  |  |  |  |
Eurodollar | 2017 Revolver And 2017 Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest at a floating rate |  | 1.00% |  |  |  |  |  |  |  |  |  |
CDOR Rate | 2017 Revolver And 2017 Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest at a floating rate |  | 0.50% |  |  |  |  |  |  |  |  |  |
Measurement Input, Maximum Leverage Ratio |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Measurement input |  |  | 4.00 |  |  |  | 3.50 | 4.00 | 3.50 |  |  |
Debt Instrument, Redemption, Period One | 2027 Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage |  |  |  | 100.00% |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period Two | 2027 Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage |  |  |  | 100.00% |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period Three | 2027 Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage |  |  |  | 101.00% |  |  |  |  |  |  |  |

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