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Summary of Change in Stockholder's Equity (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Stockholders Equity Note [Line Items] |  |  |  |
Balance at Beginning of Period |  |  | $ 1,203,450 |
Net Earnings | $ 101,380 | $ 56,387 | 219,624 | $ 161,968
Balance at End of Period | 1,416,189 |  | 1,416,189 |
Common Stock [Member] |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |
Balance at Beginning of Period |  |  | 485 |
Issuance of Restricted Stock |  |  | 1 |
Purchase and Retirement of Common Stock |  |  | (1) |
Stock Option Exercises |  |  | 2 |
Balance at End of Period | 487 |  | 487 |
Capital in Excess of Par Value [Member] |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |
Balance at Beginning of Period |  |  | 149,014 |
Stock Compensation Expense |  |  | 10,890 |
Cumulative Impact of the Adoption of ASU 2016-09 |  |  | 713 |
Shares Redeemed to Settle Employee Taxes |  |  | (2,607) |
Purchase and Retirement of Common Stock |  |  | (24,902) |
Stock Option Exercises |  |  | 23,726 |
Balance at End of Period | 156,834 |  | 156,834 |
Retained Earnings [Member] |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |
Balance at Beginning of Period |  |  | 1,061,347 |
Dividends Declared to Stockholders |  |  | (14,585) |
Cumulative Impact of the Adoption of ASU 2016-09 |  |  | (713) |
Net Earnings |  |  | 219,624 |
Balance at End of Period | 1,265,673 |  | 1,265,673 |
Accumulated Other Comprehensive Loss [Member] |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |
Balance at Beginning of Period |  |  | (7,396) |
Change in Funded Status of Pension Plan, net of tax |  |  | 591 |
Balance at End of Period | $ (6,805) |  | $ (6,805) |

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- Definition Amount of increase to additional paid-in capital (APIC) from recognition of equity-based compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=79507207&loc=d3e4534-113899 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=96864182&loc=d3e11149-113907 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=96864182&loc=d3e11178-113907 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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