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Income Tax (narrative) (detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Income Tax Disclosure [Abstract] |  |  |
Effective income tax rate | 37.00% | 32.30% | 29.90%
Effective Income Tax Rate Continuing Operations Change | 4.70% |  |
Unrecognized Tax Benefits, Period Increase (Decrease) | $ 100 | $ 100 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 100 | 100 |
Tax Credit Carryforward [Line Items] |  |  |
Valuation allowance - non-current | 1,891 | 1,861 |
Deferred Income Tax Asset, Net | 0 | 0 |
Deferred Tax Assets, Net, Noncurrent | 0 | $ 12,897 |
Deferred Income Taxes, Net | $ 4,181 |  |
Change in other items | 2.20% |  |
Permanent difference change | 2.60% |  |
New York [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Tax Credit Carryforward, Valuation Allowance | $ 900 |  |
Expiration Date | Dec. 31, 2032 |  |
California [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Tax Credit Carryforward, Valuation Allowance | $ 1,200 |  |
Expiration Date | Dec. 31, 2027 |  |
Wisconsin [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Tax Credit Carryforward, Valuation Allowance | $ 1,700 |  |
Expiration Date | Dec. 31, 2032 |  |

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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(15)(b)(2)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Liability -URI http://asc.fasb.org/extlink&oid=6510232 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(26)(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: 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(26)(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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