Number of Stock-based Compensation Plans

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- Definition

Share-based Compensation Arrangement by Share-based Award, Equity Instrument Other than Options, Equity Award Granted, Value

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- Definition

Stock Options Expiration Period After Date of Grant

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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.

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Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements.

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No definition available.

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Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Discount rate from fair value on purchase date that participants pay for shares.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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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).

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The weighted average fair value at grant date for nonvested equity-based awards issued 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).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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- Definition

The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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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).

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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.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Stock Plans (Narrative) (Details) (USD $)	12 Months Ended			3 Months Ended
Stock Plans (Narrative) (Details) (USD $)	Dec. 28, 2014 plan	Dec. 29, 2013	Dec. 30, 2012	Sep. 30, 2012	Jan. 01, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Stock-based Compensation Plans	1pki_NumberofStockbasedCompensationPlans
Total income tax benefit recognized for stock-based compensation	$ 5,400,000	$ 4,400,000	$ 6,800,000
Stock-based compensation costs capitalized as part of inventory	300,000	400,000
Options related excess tax benefit, classified as a financing cash activity	0	0	1,767,000
Aggregate intrinsic value for stock options outstanding	48,000,000
Weighted average remaining contractual term of options (in years)	3 years 5 months
Aggregate intrinsic value for stock options exercisable	41,700,000
Weighted average remaining contractual term of options exercisable (in years)	2 years 5 months
Number of shares vested and expected to vest in the future	2,800,000
Aggregate intrinsic value of vested and expected to vest stock options	47,700,000
Weighted average remaining contractual term for options vested and expected to vest	3 years 5 months
Total pre-tax stock-based compensation expense	14,464,000	14,053,000	21,031,000
Deferred compensation liability	4,100,000
Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value of stock granted (per share)	$ 42.84	$ 34.06	$ 26.18
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	35,954	28,515	0
Total pre-tax stock-based compensation expense	1,600,000	1,400,000	7,100,000
Shares/units granted	79,463	98,056	122,675
Awards/units outstanding	235,725
Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value of stock granted (per share)	$ 42.14	$ 30.65	$ 27.87
Total pre-tax stock-based compensation expense	700,000	700,000	700,000
Shares/units granted	2,373	3,263	3,580	955
Stock award program for non-employees Directors, fair market value	100,000	100,000	100,000
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value of stock granted (per share)	$ 42.61	$ 33.87	$ 25.86
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	94,000	75,000	65,000
Fair value of restricted stock awards vested	7,100,000	8,000,000	4,300,000
Total pre-tax stock-based compensation expense	7,100,000	7,500,000	8,200,000
Total unrecognized compensation cost, net of estimated forfeitures, related to nonvested stock, granted	10,000,000
Shares/units granted	261,000	289,000	358,000
Awards/units outstanding	558,000	649,000	781,000		672,000
Weighted-average period for recognition of unrecognized compensation cost, years	1 year 2 months
Option vesting period (in years)	3 years 0 months
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized under plan	5,000,000
Weighted-average grant-date fair value of stock granted (per share)	$ 41.71	$ 30.51	$ 24.51
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date	95.00%
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate	10.00%
Shares/units granted	60,870	89,521	53,961
Shares available for grant under employee stock purchase plan	1,000,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value of options	$ 11.86	$ 10.82	$ 7.36
Total intrinsic value of options exercised	22,000,000	13,800,000	13,100,000
Cash received from option exercises	24,500,000	20,300,000	32,500,000
Total pre-tax stock-based compensation expense	5,000,000	4,400,000	5,100,000
Total unrecognized compensation cost, net of estimated forfeitures, related to nonvested stock, granted	$ 5,600,000
Weighted-average period for recognition of unrecognized compensation cost, years	1 year 10 months
Option vesting period (in years)	3 years 0 months
Stock Options Expiration Period After Date of Grant	7 years 0 months
Two Thousand Nine Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized under plan	10,700,000