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Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands | Total | Series B 6.75% Convertible Perpetual Preferred Stock [Member] | Common Stock - Class A [Member] | Forward Foreign Currency Exchange Contracts [Member] | Interest Rate Swap Agreements [Member] | Preferred Stock [Member] | Common Stock [Member] | Retained Earnings [Member] | Retained Earnings [Member] Series B 6.75% Convertible Perpetual Preferred Stock [Member] | Retained Earnings [Member] Common Stock - Class A [Member] | AOCI Attributable to Parent [Member] | AOCI Attributable to Parent [Member] Forward Foreign Currency Exchange Contracts [Member] | AOCI Attributable to Parent [Member] Interest Rate Swap Agreements [Member] | Noncontrolling Interest [Member] | Cash conversion of stock [Member] Series B 6.75% Convertible Perpetual Preferred Stock [Member]
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Balance at beginning of year at Mar. 31, 2015 |  | $ 1,397,094 |  |  |  |  | $ 211,562 | $ 206,002 | $ 1,020,155 |  |  | $ (74,994) |  |  | $ 34,369 |
Balance at beginning of year, shares at Mar. 31, 2015 |  |  | 218,490 |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year, shares at Mar. 31, 2015 |  |  |  | 22,593,266 |  |  |  |  |  |  |  |  |  |  |  |
Changes in preferred and common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares converted to common stock |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of stock, shares |  |  |  | 124,469 |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Issued |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of stock, shares |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  | 0
Accrual of stock-based compensation |  | 5,206 |  |  |  |  |  | 5,206 |  |  |  |  |  |  |  |
Withholding of shares from stock-based compensation for grantee income taxes |  | (2,940) |  |  |  |  |  | (2,940) |  |  |  |  |  |  |  |
Dividend equivalents on RSUs |  | 678 |  |  |  |  |  | 678 |  |  |  |  |  |  |  |
Changes in retained earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 118,148 |  |  |  |  |  |  | 109,016 |  |  |  |  |  | 9,132 |
Cash dividends declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series B 6.75% convertible perpetual preferred stock ($67.50 per share) |  | (14,748) |  |  |  |  |  |  | (14,748) |  |  |  |  |  |  |
Common stock |  | (47,681) |  |  |  |  |  |  | (47,681) |  |  |  |  |  |  |
Stock Repurchased And Retired During Period Value Retained Earnings |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend equivalents on RSUs |  | (678) |  |  |  |  |  |  | (678) |  |  |  |  |  |  |
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation, net of income taxes |  | 3,934 |  |  |  |  |  |  |  |  |  | 4,146 |  |  | (212) |
Hedges, net of income taxes |  |  |  |  | $ 2,509 | $ (5,015) |  |  |  |  |  |  | $ 2,509 | $ (5,015) |  |
Pension and other postretirement benefit plans, net of income taxes |  | 1,004 |  |  |  |  |  |  |  |  |  | 1,004 |  |  |  |
Other changes in noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid to noncontrolling shareholders |  | (4,449) |  |  |  |  |  |  |  |  |  |  |  |  | (4,449) |
Balance at end of year at Mar. 31, 2016 |  | 1,453,062 |  |  |  |  | 211,562 | 208,946 | 1,066,064 |  |  | (72,350) |  |  | 38,840 |
Balance at end of year, shares at Mar. 31, 2016 |  |  | 218,490 |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at end of year, shares at Mar. 31, 2016 |  |  |  | 22,717,735 |  |  |  |  |  |  |  |  |  |  |  |
Changes in preferred and common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Amount Converted |  |  | $ (107,600) |  |  |  | (107,550) | 107,550 |  |  |  |  |  |  |  |
Preferred stock, shares converted to common stock |  |  | (111,072) |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Repurchase of Redeemable Convertible Preferred Stock |  | (104,012) |  |  |  |  | (104,012) |  |  |  |  |  |  |  |  |
Issuance of stock, shares |  |  |  | 69,653 |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Issued |  |  |  | 2,487,118 |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of stock, shares |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  | (107,418)
Accrual of stock-based compensation |  | 6,475 |  |  |  |  |  | 6,475 |  |  |  |  |  |  |  |
Withholding of shares from stock-based compensation for grantee income taxes |  | (2,440) |  |  |  |  |  | (2,440) |  |  |  |  |  |  |  |
Dividend equivalents on RSUs |  | 676 |  |  |  |  |  | 676 |  |  |  |  |  |  |  |
Changes in retained earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 112,506 |  |  |  |  |  |  | 106,304 |  |  |  |  |  | 6,202 |
Cash dividends declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series B 6.75% convertible perpetual preferred stock ($67.50 per share) |  | (11,061) |  |  |  |  |  |  | (11,061) |  |  |  |  |  |  |
Common stock |  | (51,437) |  |  |  |  |  |  | (51,437) |  |  |  |  |  |  |
Stock Repurchased And Retired During Period Value Retained Earnings |  | (74,353) | $ 74,353 |  |  |  |  |  |  | $ 74,353 |  |  |  |  |  |
Dividend equivalents on RSUs |  | (676) |  |  |  |  |  |  | (676) |  |  |  |  |  |  |
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation, net of income taxes |  | (6,899) |  |  |  |  |  |  |  |  |  | (6,146) |  |  | (753) |
Hedges, net of income taxes |  |  |  |  | (933) | 8,395 |  |  |  |  |  |  | (933) | 8,395 |  |
Pension and other postretirement benefit plans, net of income taxes |  | 1,475 |  |  |  |  |  |  |  |  |  | 1,475 |  |  |  |
Other changes in noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid to noncontrolling shareholders |  | (4,200) |  |  |  |  |  |  |  |  |  |  |  |  | (4,200) |
Balance at end of year at Mar. 31, 2017 |  | 1,326,578 |  |  |  |  | $ 0 | 321,207 | 1,034,841 |  |  | (69,559) |  |  | 40,089 |
Balance at end of year, shares at Mar. 31, 2017 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at end of year, shares at Mar. 31, 2017 |  |  |  | 25,274,506 |  |  |  |  |  |  |  |  |  |  |  |
Changes in preferred and common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of stock |  |  |  | $ (5,142) |  |  |  | (5,142) |  |  |  |  |  |  |  |
Preferred stock, shares converted to common stock |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of stock, shares |  |  |  | 59,843 |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Issued |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of stock, shares |  |  |  | (403,624) |  |  |  |  |  |  |  |  |  |  |  | 0
Accrual of stock-based compensation |  | 7,610 |  |  |  |  |  | 7,610 |  |  |  |  |  |  |  |
Withholding of shares from stock-based compensation for grantee income taxes |  | (2,828) |  |  |  |  |  | (2,828) |  |  |  |  |  |  |  |
Dividend equivalents on RSUs |  | 712 |  |  |  |  |  | 712 |  |  |  |  |  |  |  |
Changes in retained earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 116,168 |  |  |  |  |  |  | 105,662 |  |  |  |  |  | 10,506 |
Cash dividends declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  | (54,762) |  |  |  |  |  |  | (54,762) |  |  |  |  |  |  |
Stock Repurchased And Retired During Period Value Retained Earnings |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of stock, retained earnings |  |  |  | $ (16,468) |  |  |  |  |  |  | $ (16,468) |  |  |  |  |
Dividend equivalents on RSUs |  | (712) |  |  |  |  |  |  | (712) |  |  |  |  |  |  |
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation, net of income taxes |  | 14,162 |  |  |  |  |  |  |  |  |  | 14,534 |  |  | (372) |
Hedges, net of income taxes |  |  |  |  | $ 223 | $ 4,498 |  |  |  |  |  |  | $ 223 | $ 4,498 |  |
Pension and other postretirement benefit plans, net of income taxes |  | 2,613 |  |  |  |  |  |  |  |  |  | 2,613 |  |  |  |
Reclassification of Tax Effects out of Accumulated Other Comprehensive Income | [1] |  |  |  |  |  |  |  | 12,373 |  |  | (12,373) |  |  |  |
Other changes in noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid to noncontrolling shareholders |  | (7,350) |  |  |  |  |  |  |  |  |  |  |  |  | (7,350) |
Balance at end of year at Mar. 31, 2018 |  | $ 1,385,302 |  |  |  |  |  | $ 321,559 | $ 1,080,934 |  |  | $ (60,064) |  |  | $ 42,873 |
Balance at end of year, shares at Mar. 31, 2018 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at end of year, shares at Mar. 31, 2018 |  | 24,930,725 |  | 24,930,725 |  |  |  |  |  |  |  |  |  |  |  |
[1] | In the fourth quarter of fiscal year 2018, the Company adopted FASB Accounting Standards Update 2018-02, which addressed the disproportionate income tax effects on pretax amounts recorded in accumulated other comprehensive income (loss) arising from the enactment of the Tax Cuts and Jobs Act of 2017. With the adoption of ASU 2018-02, the disproportionate tax effects were reclassified to retained earnings, and the resulting tax effects remaining in accumulated other comprehensive income (loss) are reflective of the rates which those amounts will ultimately be taxed.

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- Definition Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + 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(29)) -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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Number of shares that have been repurchased and retired during the period. + 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(28)) -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 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 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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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 2: 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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 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(29)) -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 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4I -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4590271-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4568740-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4568447-111683 + Details
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