Stockholders' equity	3 Months Ended
Stockholders' equity	Jun. 30, 2013
Stockholders' equity [Abstract]
Stockholders' equity	8. Stockholders' equity: Stock based compensation: Under the 2007 Equity Incentive Plan (the 2007 Plan), as amended, 29 million shares were authorized to be issued to employees of the Company at prices not less than the fair market value of the common stock at the date of grant. The 2007 Plan provides for the granting of incentive and nonqualified stock options, restricted stock, stock appreciation rights and stock equivalent units. These awards generally vest in three to five years. Stock option grants may be exercisable for up to ten years from the date of issuance. As of June 30, 2013, 4.0 million shares were available for grant under the 2007 Plan. Stock based compensation expense of $14.7 million ($9.1 million net of tax) and $12.9 million ($9.3 million net of tax) was recorded for the three-month periods ended June 30, 2013 and June 30, 2012, respectively. This expense is charged to Cost of sales, SG&A expense and R&D expense, as appropriate.

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

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