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Pension and Profit Sharing Plans - Additional information (Detail) $ in Thousands | 12 Months Ended
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Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($) Employee CompensationPlan | Mar. 31, 2015 USD ($) | Mar. 31, 2014 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Amendment of pension plan service cost |  |  | $ 805 |
Amendment in pension plan |  | We amended one of our pension plans during March 2015, which increased our prior service cost by approximately $0.8 million. This amount is included in other comprehensive income and will be recognized in our statement of earnings as pension expense over the next three fiscal years. |  |
Costs relating to employer discretionary contributions |  | $ 6,200 | 5,300 | $ 4,500
Current actuarial estimates contributions |  | $ 300 | 200 | 200
Number of employees covered under multi-employer pension plans | Employee |  | 60 |  |
Number of multi-employer plans | CompensationPlan |  | 5 |  |
Collective bargaining agreement for employer covered under multi-employer plans, Expiration ending date |  | Mar. 31, 2017 |  |
Expenses related to Multi employer plans |  | $ 1,300 | $ 1,000 | $ 200
Scenario Forecast [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expenses related to Multi employer plans | $ 1,300 |  |  |
Salaried Employees [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employees fully vesting in employer's contributions made beginning in 2007, requirement years |  | 6 years |  |
Hourly Employees [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employees fully vesting in employer's contributions made beginning in 2007, requirement years |  | 3 years |  |
Minimum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Current actuarial estimates contributions for fiscal year 2017 |  | $ 500 |  |
Maximum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Current actuarial estimates contributions for fiscal year 2017 |  | $ 1,000 |  |

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- Definition Description of a change in the substantive terms of an existing defined benefit plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (r) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Amendment -URI http://asc.fasb.org/extlink&oid=49173939 + Details
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