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Financing Arrangements (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended		3 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Apr. 30, 2015	Apr. 30, 2014	Sep. 29, 2014	Feb. 24, 2014
Debt Instrument [Line Items]
Debt Instrument, Interest Rate During Period	2.08%	2.06%
Line of Credit Facility, Covenant, Leverage Ratio, Minimum	3.25
Debt Instrument, Covenant, Leverage Ratio, Maximum	3.5
Letters of Credit Outstanding, Amount				$ 2,980
Collateral Agreement	65.00%shlo_CollateralAgreement
Equipment Security Note, Long-term Portion	(268,102)us-gaap_LongTermDebtNoncurrent	(119,384)us-gaap_LongTermDebtNoncurrent
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments	6,967
Derivatives, Interest Rate Swap, Maturity	5 years
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(1,558)	0
Net current-period other comprehensive income (loss)	(10,799)	5,229
Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.05%
Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.77%
Lender Two [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum Borrowing Capacity					360,000
Line of Credit Facility, Remaining Borrowing Capacity				96,520
London Interbank Offered Rate (LIBOR) [Member] \| Lender Two [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.00%
Base Rate [Member] \| Lender Two [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.00%
Aggregate Revolving A [Member] \| Lender Two [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum Borrowing Capacity					235,000
Aggregate Revolving B [Member] \| Lender Two [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum Borrowing Capacity					125,000
Equipment Security Note [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.47%
Debt Instrument, Periodic Payment	44
Equipment security note	1,985	2,461
Equipment Security Note, Short-Term Portion	489
Equipment Security Note, Long-term Portion	(1,496)
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Equipment security note	6,967	0
Equipment Security Note, Short-Term Portion	861
Insurance Financing Agreement [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.87%
Debt Instrument, Periodic Payment	95
Short-term Debt	568	405
Interest Rate Swap [Member] \| Lender Two [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Derivative, Notional Amount						75,000
Derivative, Fixed Interest Rate						2.74%
Derivative, Incremental Amounts						$ 25,000
After January 31, 2015 [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Lender Two [Member] \| Minimum [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.50%
After January 31, 2015 [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Lender Two [Member] \| Maximum [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			2.50%
After January 31, 2015 [Member] \| Base Rate [Member] \| Lender Two [Member] \| Minimum [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			0.25%
After January 31, 2015 [Member] \| Base Rate [Member] \| Lender Two [Member] \| Maximum [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.50%