Equity (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Oct. 01, 2011	Oct. 02, 2010	Oct. 01, 2011	Oct. 02, 2010
Summary of Changes in Equity
Balance at beginning of period			$ 3,304.7	$ 3,116.6
Comprehensive income:
Net income attributable to RLC	233.5	205.2	417.6	326.0
Foreign currency translation adjustments			(2.7)	45.5
Net realized and unrealized gains (losses) on derivatives			34.8	(8.0)
Net unrealized gains (losses) on available-for-sale investments			(0.1)	0
Net unrealized gains (losses) on defined benefit plans			(0.4)	0
Total comprehensive income			449.2	363.5
Cash dividends declared			(36.9)	(19.1)
Repurchases of common stock			(417.8)	(347.7)
Shares issued and equity grants made pursuant to stock-based compensation plans			84.7	59.2
Balance at the end of period	$ 3,383.9	$ 3,172.5	$ 3,383.9	$ 3,172.5