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Shareholders' Equity - Narrative (Details) - USD ($) | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2007 | Apr. 30, 2016 | May 02, 2015 | May 03, 2014 | Apr. 27, 2013 | Apr. 28, 2012 | Apr. 30, 2011 | Sep. 30, 2015 | May 01, 2015 | Jul. 15, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  | $ 100,000,000 |  |
Purchase of common stock (in shares) |  | 1,997,298 |  |  |  |  |  |  |  |
Purchase of common stock |  | $ 62,300,000 | $ 0 | $ 0 |  |  |  |  |  |
Common stock - par value per share (in dollars per share) |  | $ 0.50 | $ 0.50 |  |  |  |  |  |  |
Dividends paid |  | $ 13,500,000 | $ 13,800,000 | 11,300,000 |  |  |  |  |  |
Share price |  |  |  |  |  |  |  |  | $ 43.59 |
Compensation expense |  | 7,400,000 | 4,300,000 | 3,300,000 |  |  |  |  |  |
Unrecognized equity-based compensation cost |  | $ 37,900,000 |  |  |  |  |  |  |  |
Weighted average period for recognition of unrecognized equity-based compensation cost |  | 3 years 11 months 18 days |  |  |  |  |  |  |  |
2014 Incentive Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares authorized for grant (in shares) |  |  |  |  |  |  |  |  |  | 3,000,000
Contingent reduction in number of shares authorized for grant (in shares) |  |  |  |  |  |  |  |  |  | 1
Number of shares available for grant (in shares) |  | 1,225,500 |  |  |  |  |  |  |  |
Compensation expense |  | $ 6,400,000 | $ 500,000 | 0 |  |  |  |  |  |
2014 Incentive Plan | RSAs |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Awarded shares (in shares) |  | 1,185,000 | 13,500 |  |  |  |  |  |  |
Vested (in shares) |  | 24,000 | 13,500 |  |  |  |  |  |  |
Compensation expense |  | $ 3,600,000 | $ 500,000 | 0 |  |  |  |  |  |
2014 Incentive Plan | RSAs | Five-year RSA cliff, performance-based |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Award vesting period |  | 5 years |  |  |  |  |  |  |  |
Awarded shares (in shares) |  | 774,000 |  |  |  |  |  |  |  |
Unearned compensation expense |  | $ 21,900,000 |  |  |  |  |  |  |  |
2014 Incentive Plan | RSAs | Executives and non-executive members of management |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Awarded shares (in shares) |  | 1,161,000 |  |  |  |  |  |  |  |
2014 Incentive Plan | RSAs | Independent directors |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) |  | 24,000 | 13,500 |  |  |  |  |  |  |
Compensation expense |  | $ 800,000 | $ 1,000,000 |  |  |  |  |  |  |
2014 Incentive Plan | RSUs |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Awarded shares (in shares) |  | 576,000 | 0 |  |  |  |  |  |  |
Vested (in shares) |  | 0 | 0 |  |  |  |  |  |  |
Unearned compensation expense |  |  |  |  |  |  |  |  |  | $ 18,400,000
Compensation expense |  | $ 2,800,000 | $ 0 | $ 0 |  |  |  |  |  |
2014 Incentive Plan | RSUs | Five-year RSU, 30% in fiscal 2018, 30% in fiscal 2019 and 40% in fiscal 2020 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Award vesting period |  | 5 years |  |  |  |  |  |  |  |
Awarded shares (in shares) |  | 576,000 |  |  |  |  |  |  |  |
Unearned compensation expense |  | $ 15,600,000 |  |  |  |  |  |  |  |
2014 Incentive Plan | RSUs | Five-year RSU, 30% in fiscal 2018 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Award vesting percentage |  | 30.00% |  |  |  |  |  |  |  |
2014 Incentive Plan | RSUs | Five-year RSU, 30% in fiscal 2019 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Award vesting percentage |  | 30.00% |  |  |  |  |  |  |  |
2014 Incentive Plan | RSUs | Five-year RSU, 40% in fiscal 2020 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Award vesting percentage |  | 40.00% |  |  |  |  |  |  |  |
2014 Incentive Plan, 2020 EBITDA Less Than Threshold | RSAs |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vested (in shares) |  | 0 |  |  |  |  |  |  |  |
2014 Incentive Plan, 2020 EBITDA Threshold | RSAs |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
2020 EBITDA goal |  | $ 198,900,000 |  |  |  |  |  |  |  |
2014 Incentive Plan, 2020 EBITDA Target | RSAs |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Awarded shares (in shares) |  | 774,000 |  |  |  |  |  |  |  |
2020 EBITDA goal |  | $ 221,000,000 |  |  |  |  |  |  |  |
Unearned compensation expense |  |  |  |  |  |  |  |  |  | $ 24,800,000
Compensation expense |  | $ 2,800,000 |  |  |  |  |  |  |  |
2014 Incentive Plan, 2020 EBITDA Maximum | RSAs |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Awarded shares (in shares) |  | 387,000 |  |  |  |  |  |  |  |
2020 EBITDA goal |  | $ 243,100,000 |  |  |  |  |  |  |  |
2010 Stock Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares authorized for grant (in shares) |  | 2,000,000 |  |  |  |  |  |  |  |
Awarded options to purchase number of shares (in shares) |  | 108,000 | 120,000 | 120,000 |  |  |  |  |  |
Compensation expense |  | $ 400,000 | $ 2,800,000 | $ 2,600,000 |  |  |  |  |  |
2010 Stock Plan | RSAs |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Annual vesting percentage |  |  |  |  |  | 33.30% |  |  |  |
Awarded shares (in shares) |  | 0 | 0 | 0 |  | 100,000 | 640,000 |  |  |
Vested (in shares) |  | 33,333 | 633,333 | 0 |  |  |  |  |  |
Historic multiple of EBITDA, used to calculate internal enterprise value for determining size of awards |  |  |  |  |  | 7.5 | 7.5 |  |  |
Compensation expense |  | $ 0 | $ 1,500,000 | $ 1,500,000 |  |  |  |  |  |
2010 Stock Plan | Stock Options |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Awarded options to purchase number of shares (in shares) |  | 0 | 108,000 | 120,000 |  |  |  |  |  |
Award term |  | 10 years |  |  |  |  |  |  |  |
Annual vesting percentage |  | 33.30% |  |  |  |  |  |  |  |
Award vesting period |  | 3 years |  |  |  |  |  |  |  |
Intrinsic value of outstanding options |  | $ 1,700,000 |  |  |  |  |  |  |  |
Compensation expense |  | $ 300,000 | $ 1,200,000 | $ 800,000 |  |  |  |  |  |
2010 Stock Plan | RSUs |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Annual vesting percentage |  |  |  |  |  |  | 20.00% |  |  |
Awarded shares (in shares) |  | 0 | 0 | 0 |  |  | 320,000 |  |  |
Vested (in shares) |  | 0 | 60,000 | 60,000 |  |  |  |  |  |
Award vesting percentage |  |  |  |  |  |  | 100.00% |  |  |
Compensation expense |  | $ 100,000 | $ 100,000 | $ 300,000 |  |  |  |  |  |
2010 Stock Plan | Bonus in Lieu of Dividends |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Restriction period for awards |  | 5 years |  |  |  |  |  |  |  |
2010 Stock Plan | Tandem Cash Award |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum percentage of RSA award that could be the value of Tandem Cash Award |  | 40.00% |  |  |  |  |  |  |  |
Compensation expense |  |  | 5,600,000 | 3,900,000 |  |  |  |  |  |
2007 Stock Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares authorized for grant (in shares) |  | 1,250,000 |  |  |  |  |  |  |  |
Compensation expense |  | $ 600,000 | $ 1,000,000 | $ 700,000 |  |  |  |  |  |
Total number of shares with respect to which awards may granted to any participant in any calendar year |  | 200,000 |  |  |  |  |  |  |  |
2007 Stock Plan | RSAs |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) |  |  | 13,500 | 27,000 |  |  |  |  |  |
Awarded shares (in shares) |  | 0 | 13,500 | 27,000 |  |  |  |  |  |
Vested (in shares) |  | 0 | 13,500 | 27,000 |  |  |  |  |  |
Compensation expense |  | $ 0 | $ 500,000 | $ 400,000 |  |  |  |  |  |
Number of shares converted from RSAs to RSUs outstanding (in shares) |  |  |  | 0 |  |  |  |  |  |
2007 Stock Plan | Stock Options |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Awarded options to purchase number of shares (in shares) |  | 0 | 50,500 | 42,500 | 42,500 |  |  |  |  |
Award term |  | 10 years |  |  |  |  |  |  |  |
Annual vesting percentage |  | 33.30% |  |  |  |  |  |  |  |
Intrinsic value of outstanding options |  | $ 400,000 |  |  |  |  |  |  |  |
Compensation expense |  | $ 600,000 | $ 500,000 | $ 300,000 |  |  |  |  |  |
2007 Stock Plan | RSUs |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares converted from RSAs to RSUs outstanding (in shares) |  | 207,672 |  |  |  |  |  |  |  |
Number of day after termination that awards will be issued and delivered | 30 days |  |  |  |  |  |  |  |  |
Converted RSUs delivered (in shares) |  | 17,328 |  |  |  |  |  |  |  |
2007 Stock Plan | Converted from RSAs to RSUs |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares converted from RSAs to RSUs outstanding (in shares) | 225,000 |  |  |  |  |  |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 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=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of share instruments newly issued under a share-based compensation plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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=6928386&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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