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Percentage of expiration and forfeiture of share-based compensation awards.

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No definition available.

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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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No definition available.

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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 cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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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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No definition available.

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

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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No definition available.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of vesting of share-based compensation awards.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Number of share options (or share units) exercised during the current period.

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Share-Based Payments (Details 2) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended			4 Months Ended	6 Months Ended
	Mar. 29, 2015	Mar. 28, 2015	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2015	Jun. 30, 2014
Share-Based Payments
Allocated share-based compensation			$ 6,616,000		$ 3,665,000		$ 2,231,000	$ 7,116,000
Additional disclosures
Proceeds from issuance of common stock under stock plans							$ 21,210	$ 1,911
Awards vesting on the one-year anniversary
Share-Based Payments
Award vesting period							1 year
Additional disclosures
Vesting percentage							25.00%
Awards vesting on the quarterly basis
Share-Based Payments
Award vesting period							3 years
Additional disclosures
Vesting percentage							6.25%
Stock options
Weighted average assumptions used in fair value calculations
Expected volatility (as a percent)			54.00%		63.00%		60.00%	66.00%
Expected life (years)			5 years 4 months 24 days		5 years 2 months 12 days		6 years 1 month 6 days	6 years 1 month 6 days
Risk-free interest rate (as a percent)			2.10%		2.20%		1.80%	2.20%
Additional disclosures
Remaining unrecognized compensation cost related to nonvested awards			$ 19,600			$ 19,600	$ 19,600
Weighted average remaining requisite service period							2 years 7 months 6 days
Exercised (in shares)							(1,537,353)
Proceeds from issuance of common stock under stock plans							$ 20,700
Employee Stock Purchase Plan
Share-Based Payments
Allocated share-based compensation			$ 92,000		$ 105,000		$ 188,000	$ 209,000
Weighted average assumptions used in fair value calculations
Expected volatility (as a percent)			61.00%		67.00%		61.00%	66.00%
Expected life (years)			6 months		6 months		6 months	6 months
Risk-free interest rate (as a percent)			0.10%		0.10%		0.10%	0.10%
Additional disclosures
Proceeds from issuance of common stock under stock plans							$ 500
Shares issued during period							58,398
Restricted stock awards
Share-Based Payments
Allocated share-based compensation			$ 3,877,000		$ 999,000		$ (2,973,000)	$ 2,155,000
Additional disclosures
Remaining unrecognized compensation cost related to nonvested awards			$ 3,300			$ 3,300	$ 3,300
Weighted average remaining requisite service period							9 months 18 days
Non-vested shares of restricted stock, Number of Shares
Nonvested at the beginning of the period (in shares)				1,174,000			1,174,000
Granted (in shares)							250,000
Vested (in shares)							(451,000)
Forfeited (in shares)							(130,000)
Nonvested at the end of the period (in shares)			843,000			843,000	843,000
Non-vested shares of restricted stock, Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)				$ 15.15			$ 15.15
Granted (in dollars per share)							13.02
Vested (in dollars per share)							15.05
Forfeited (in dollars per share)							14.57
Nonvested at the end of the period (in dollars per share)			$ 14.66			$ 14.66	$ 14.66
Time-based restricted stock awards
Additional disclosures
Remaining unrecognized compensation cost related to nonvested awards			$ 7,000			$ 7,000	$ 7,000
Weighted average remaining requisite service period							2 years 10 months 24 days
Non-vested shares of restricted stock, Number of Shares
Nonvested at the end of the period (in shares)			511,000			511,000	511,000
Time-based restricted stock awards \| Officers
Non-vested shares of restricted stock, Number of Shares
Granted (in shares)							250,087
Performance-based restricted stock awards
Share-Based Payments
Award vesting period	1 year	1 year
Allocated share-based compensation	$ 9,800	$ 10,500				$ 6,100
Reversal of cumulative compensation cost				$ 10,500
Non-vested shares of restricted stock, Number of Shares
Forfeited (in shares)	(117,898)
Nonvested at the end of the period (in shares)			332,000			332,000	332,000
Performance-based restricted stock awards \| Shares vesting upon FDA approval
Additional disclosures
Vesting percentage	50.00%	50.00%
Performance-based restricted stock awards \| Awards vesting on the one-year anniversary of approval from FDA
Share-Based Payments
Percentage of reduction on original number of shares	15.00%
Additional disclosures
Vesting percentage	50.00%	50.00%
Performance-based restricted stock awards, M356
Non-vested shares of restricted stock, Number of Shares
Granted (in shares)		949,620